From David Holowiski:
Using the new copy and paste functionality of 3.0, you can copy text from any application, and when you launch this app you can tweet the text. If the text is over 140 characters, you can trim the text, or trim the text using the Trimtext.com service.
This app is FREE because it is Ad supported. Ads are displayed at the top of the screen.
Note: This is not a full featured Twitter client like TweetDeck, Twittelator or Twitterfon - you can't view tweets in this application, only send them. This is the perfect companion to another full featured twitter client