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Leonard Lin put together an excellent list of the presentations at Web 2.0 Expo, complete with links to slides and video when available. All of the presentations are worth checking out, but I wanted to point out the ones on the list from Yahoo (not all slides are available yet -- we will add to the list as they become available):

A Flickr approach to Making Sense of the World, from Rev Dan Catt of Flickr

Capacity Planning for Web Operations, from John Allspaw of Flickr

Grasping Social Patterns, from Christian Crumlish of Yahoo! Developer Network (from Ignite SF)

Tagging: Opportunities and Challenges of Scale, from Kakul Srivastava of Flickr

Also, be sure to check out CTO Ari Balogh's keynote in which he introduces Y!OS (the Yahoo! Open Strategy) and Neal Sample's deep-dive into Y!OS.

Popularity: 18% [?]

Over the past couple of months, we've been quietly working at Brickhouse and focusing on what matters most: delivering delightful new products. In February and March, the teams at Brickhouse were busy shipping Yahoo! Live (which launched on February 7) and Fire Eagle (launched March 5). Both are thriving in their early days.

Yahoo! Live, our experiment in social broadcasting, has been blowing the doors off, hitting over a million users in its first few weeks. We've featured broadcasters ranging from rock stars (Motley Crue) to well-known DJs (Paul Oakenfold at the Winter Music Conference) to emerging stars like Sheena Melwani. Yahoo! Live can be purely entertaining, but it also touches people's lives in wonderfully unexpected ways. Just as one example, the deaf community quickly discovered Live and created the DeafRead channel, which has become an all-hours gathering spot for signing and chatting (reading this testimonial really warmed my heart). Yahoo! Live has become a truly meaningful "third place" for all types of social interactions. With a full-featured developer API, developers can build their own experiences around the Live platform, too.

Fire Eagle launched as an invite-only developer beta barely six weeks ago and is building momentum as we move towards a general release (request an invite at the Fire Eagle home page). On the day we launched, Marshall Kirkpatrick at ReadWriteWeb wrote: "Standards based platform plus strong privacy equals the best scenario I can imagine for a location tracking service. We'll see what kinds of innovative applications get built on top of it." Well, the developer community has responded with enthusiasm and new applications are emerging regularly. If you have an invite, you can already leverage Fire Eagle in a growing gallery of applications including Dopplr, Firebot, Dashboard widgets for OS X (dmg file), Loki toolbar for IE/Firefox, a Movable Type plugin, Navizon, Wikinear, and ZoneTag. Aside from the applications listed in our gallery, many other developer partners have integrated with Fire Eagle or will be integrating soon: Plazes, Outside.in (details here), Lightpole, Rummble, plus many more in the pipeline. If you would like to become a Fire Eagle developer, join the developer group.

We're excited about Yahoo! Live and Fire Eagle, and this week's Web 2.0 Expo (taking place just down the street from us at Brickhouse in San Francisco) gives us the perfect opportunity to thank the communities who have helped these projects do so well in their first several weeks, so we're throwing a party in the Brickhouse space as part of the "South Park Crawl." Just RSVP on Upcoming or show us your Web 2.0 Expo pass to get in. The Fire Eagle and Live teams will be on hand and we'll have loads of Fire Eagle invites, a couple of our favorite DJs from Yahoo! Live, and plenty of beer. Be sure to use Fireball "Web 2.0 Expo edition" (a Fire Eagle / Twitter / Upcoming app that just launched last night!) to find out where your friends are during the show.

Thank you for using Fire Eagle and Yahoo! Live, and see you at the party!

Popularity: 28% [?]

Last week, the Fire Eagle development team hosted an informal evening meetup at Yahoo!'s Brickhouse office to share news about Fire Eagle, a system that brokers location information and helps users safely share information about their location with sites, services and people on the Internet. Fire Eagle launched at ETech earlier this month.

In this video, Tom Coates describes some of the first Fire Eagle apps that are emerging, like an integration with Dopplr and a plugin for Movable Type, and shares ideas and imaginings for new location-aware services.

Popularity: 53% [?]

Yahoo! Developer Network evangelist Jeremy Zawodny spoke with Paul Donnelly from the Pipes team about the new Pipes badges that launched today. A badge is a simple way to display the output of your favorite Yahoo! Pipe on your website or blog.

There are three types of Pipes badges you can add like widgets to your webpage or blog: the map badge, when there's geocoded data; an image badge that includes slideshow functionality; and a list badge, for all other valid data. Help us spot the first generation of creative Pipes badges out in the wild, by posting your badge sightings and URLs in comments here. Read more about this release or watch this video introduction:

Popularity: 57% [?]

The times they are a changing. This year the politics of fear go head to head with the audacity of hope. Democrats have come out in record numbers to vote in the presidential primaries and caucuses to date. The current Democratic front runner, Barack Obama, has inspired a new generation of young and independent voters. Both he and Hillary Clinton are promoting plans which would help create a more fair and equitable United States.

But the race between Obama and Hillary Clinton is very close. No matter what happens in Pennsylvania or any of the other remaining states, neither candidate will have clinched the nomination when all the voting is finished in June. The next presidential candidate will be determined by the remaining Democratic superdelegates.

No matter who is chosen, it will be a proud and groundbreaking moment for the United States. If a Democrat is elected, the next US president will be either a woman or a black man.

If you were a superdelegate, how would you vote? The Yahoo! Media Innovation Group has built an app called Be a Superdelegate, which runs on both Facebook and MySpace. It lets you cast your own superdelegate vote and show support for your presidential pick by putting a virtual campaign button on your Facebook or MySpace profile page. What’s especially fun about the Superdelegate app is that a vote you cast on MySpace will appear on Facebook and vice versa. Like the Texas prima-caucus, you can even vote twice – once on each network.

Earlier this month, MySpace went live with their application platform, which supports OpenSocial. Now we’re starting to see the emergence of cross platform social apps – a pretty cool development. Could it be that leading Internet companies large and small can work together and share content and data to make the Web a better place for everyone? Yes we can. Yes we can.

Be a Superdelegate today!

Hillary Obama battle by mr_magoo

Popularity: 62% [?]