by Konstantin Kovshenin on WordPress.org
Your very own TinyURL within your OWN domain! If you DO promote your blog posts in Twitter, then you MUST make your links look cool!

The configuration panel
The plugin creates a shorter link for every blog post, so instead of http://kovshenin.com/wordpress/plugins/twitter-friendly-links/ you can use http://kovshenin.com/712. Sweet, huh? Here’s a video presentation: Twitter Friendly Links for WordPress
twitter_link() functionpermalink_to_twitter_link() which takes a permalink as an argument and returns a Twitter Friendly Link (if exists)YES, I do consider feature requests, and that is what makes this plugin work. The discussions go here: Twitter Friendly Links