iPhone
(payware) Works with identi.ca, any other StatusNet install and Twitter.
StatusNet Mobile is a freely available, open-source client app for connecting with your friends and coworkers on all your StatusNet networks.
The official mobile client build is available through...
Update: Twitter's iPhone app no longer works with StatusNet or any other third-party Twitter-compatible service as of July 2010.
Twitter official client (formerly Tweetie 2) - Works with any Twitter-...
Works with Identi.ca and Twitter.
See how to make Twitterrific work with StatusNet.
