As I’ve made abundantly clear over the past several days, just about every service that has anything to do with location is launching something at the SXSW festival which starts tomorrow in Austin, Texas. Don’t believe me, here’s a small sampling ( Foursquare , Gowalla , Loopt , Whrrl , Plancast , Brizzly , Twitter ).

Aol launched Lifestream , a social aggregator and publisher, as part of their AIM platform at TechCrunch50 Last Fall. Since then it has gained nearly 2 million users, say Aol.

Since it launched last July at our Realtime Stream CrunchUp, Brizzly has been one of the best web-based Twitter apps. It offers support for viewing pictures inline, shortened link expansion, multiple Twitter accounts, and even some Facebook support . But they’ve been quiet in recent months

No wonder Apple is suing HTC for patent infringement over its Android phones. In the three months between October and January, Android’s overall share of smartphone subscribers in the U.S.

Brands are engaging in the conversations that are taking place on social media sites now more than ever. But in order to tap into the social conversations that are taking place on the web, brands and agencies need to have a powerful tool to track, measure and engage sites such as Twitter, YouTube, Facebook and others. One of the leaders in the social media tracking space, Radian6, is launching a new Engagement Console to streamline this process

We’ve written about Twitter client Sobees, which is working to create the best social media client on the market, competing with both TweetDeck and Seesmic. Today Sobees is releasing a new version of its Windows native desktop app built in .NET, complete with realtime search, a redesign and more. The new client includes support for Facebook, Twitter, MySpace, FriendFeed and LinkedIn (which was added late last year)