Tweetie - Twiiter client for iphone

Tweet

Tweetie version 2 is one of the most feature-packed, well designed Twitter clients
available for the iPhone. It's incredibly simple to use whether you're a basic Twitter
user or the commander of an entire army of Twitter followers. It's near perfect
in every respect, a must have.

Quick Glance

•      Seamlessly handle multiple Twitter accounts
•      Persistence: more than caching tweets, Restores UI if you quit or get a call
•      Full landscape support
•      Live-filter your tweet stream
•      Post photos and videos, even configure your own custom image host
•      Improved compose screen with hashtags, @people picker, URL shortening
•      Link Twitter contacts to Address Book contacts
•      Follow, unfollow, block and unblock from multiple accounts simultaneously
•      Threaded Direct Messages and improved conversation navigation
•      TextExpander integration
•      Rich integration with Follow Cost, Tweet Blocker, Favstar.fm and more
•      Edit your own Twitter profile
•      Nearby map view
•      Translate tweets
•      In-app rich text email composition

In words of Tweetie
    
    The Twitter client that redefined Twitter clients is back, and it's even better.
    Rewritten from the ground up with a fast and powerful new core, Tweetie 2
    offers the most polished mobile Twitter experience around.

Website

       http://www.atebits.com/tweetie-iphone/