Snitter is a tool built in Adobe AIR to send Tweets to your Twitter stream. It was created by a Canadian, Jonathon Snook, who wanted certain features in Twitter that didn't exist.

I've used Twitterific quite a bit, and there are issues with it I don't like. It is a little bit of a challenge to shut off--to quite out of the application you have to go into the application's configuration menu which strikes me as a little odd. With Snitter, you go to your regular menu and quit in a pretty standard way. Twitterific does a fine job of allowing you to post to Twitter--but it is only MacOS friendly. Snitter is available for Windows and MacOS.

Snitter allows you to look at your tweets, archives, replies, favourites, direct message, friends, and followers in all in a little pull down at the top of the application window. The configuration menu is easy to use.

First you have to download AIR and set it up. On a Mac, that is a simple download and double click. After that, you download and load up Snitter. Again, a double click.

Snitter is in Alpha, so use it at your own risk but it seems pretty clean for it's development state.