Tweetie is a fast, full-featured twitter client for iPhone and iPod touch. It offers everything you’d expect – from your timeline to trends – all with an incredibly polished user interface, fantastic performance, and unparalleled ease-of-use.
Application Link: http://www.atebits.com/tweetie-iphone
Posterous lets you post multiple photos, video, music, all through email. Autopost to twitter via email. Best Mobile Startup Finalist, Crunchies 2008
Application Link: http://posterous.com/
We harness the power of social working and blast your thoughts, muses, complaints, frustrations, gloats, rhymes and other flavorful compounds all over the internet.
Application Link: http://ping.fm/
Tweets sent to Twitter.com using SMS text
Application Link: http://help.twitter.com/forums/59008/entries/14020
Gravity is a fully-featured Twitter client for S60 based mobile phones from Nokia & Samsung. It supports multiple Twitter and Identi.ca accounts, multiple Twitter searches, Groups, Audio Alerts and Image uploading to MobyPicture, TwitPic, TwitGoo and Posterous. And it’s also running in the background!
Application Link: http://mobileways.de/products/gravity/gravity/
Is a free mobile service that offers you a selection of fun and userful mobile applications, including Twitter, Facebook, Sports and much more. Works on most Java phones.
Application Link: http://snaptu.com/a/twitter
The best Mobile web App for Twitter to date. Described as ‘m.twitter on steroids’, dabr is ad-free and provisioned for S60, Android, the iPhone and Blackberry…
Application Link: http://dabr.co.uk/
For more: check the Twitter apps refrence website: http://oneforty.com/