In the online social networking space you've got your big guns: MySpace, to a lesser extent Twitter and for business users, LinkedIn. Facebook is also extremely popular and now, Facebook's client for iPhone and iPod touch has been updated to version 2.1.
Among the changes for this update include fewer crashes (that's an important one), corrected timestamps for all time zones, improved sync time and faster loading of the inbox. It's also worth noting that Facebook for iPhone and iPod touch requires iPhone 2.2 firmware.
Other iPhone and iPod touch apps updated recently include Pandora, Things, Darkslide, Lists and the trifecta of iSteam, iFog and icanhascheezburger. So, fire up iTunes or the Applications app on your iPhone / iPod touch and go get 'em!
Be sure to let us know how they work in the comments.