TweetCommand.Net
TweetCommand.NET allows you to send tweets from them command line. I build this application to tweet easily with Launchy or Executor.
Here is a screencast how to setup TweetCommand.Net with Launchy and the Runner-Plugin. (Note: The Runner-Plugin is integrated by default in Launchy). Please watch the Screencast in HD-Mode.
Requirements
Windows XP/Vista/7
.NET Framework 4.0