Our favorite URL shortening service, Bit. ly , has just released a Firefox plug-in that you'll probably want to add to your browser. It lets users hover over shortened URLs from a wide variety of services, including TinyURL, and see the resulting full URL as well as how many people have clicked through the shortcut.
I now use the firefox plugin "shareaholic" it has bit.ly and around 30 other networks/bookmarking sites which cover places like myspace/mixx/yahoo buzz etc. and regulars like facebook,twitter and delicious - this one button is like a replacement for flock, that weened me from Internet Explorer - to firefox http://blog.shareaholic.com/?src=sm