TWEETCASTER, THE TWITTER CLIENT for Blackberry and Android, has given me very stable performance during a month of constant use. I recommend it as an Android application. In addition to standard Twitter functions, TweetCaster allows me to set up multiple Twitter accounts (essential when no one is listening so I can tweet myself discreetly), integrated retweets (allowing you to modify the retweet), integrated Twitter lists, notifications that vibrate the phone if you prefer, offline tweet caching for thousands of tweets to read while on the plane, URL shortening (and previews), phot0 attachment, threaded direct messages, threaded conversations, font/theme customization, landscape support, profile editing and tweet filtering.
Tweetcaster has stopped working several times for me when I permitted Juice Defender to rein in my active use of wifi but that's a power-saving issue, not a Tweetcaster issue.
I like the cool blue visual interface with its five tabs showing my full listing of my tweets, tweets that mention me, direct messages, favorites, and lists that I follow. I need to use the list function more frequently. Small yellow dots on the first three tabs let me know when I have new tweets, new replies or new direct messages.
Bonus Track: Beck's Record Club covering Inxs "Never Tear Us Apart"