Tvider is single-task web-based Twitter app for tweeting videos, images, and audio/voice from mobile devices or webcams. Tvider is available on all major mobile platforms including iPhone, Blackberry, Android, Symbian, Java and BREW. For this review we tested the web app in OS X and Windows.
TweetMic lets you record audio clips on your iPhone and post them to Twitter. It has an intuitive interface that makes posting audio files on Twitter completely painless. TweetMic Pro has multiple twitter account support.