Shorten url

Dick H Box

A Firefox add-on, UrlbarExt, has a 1-click URL-shortening tool, amongst other very useful tools:

Extends the Location Bar with set of commands to (Shorten URL's,Copy URL,Search site,Go up, pNg, Tag pages easily ,Navigate through sequential URL's,View page cached version,Surf anonymously using online phproxy servers, Twitter)
The proxy tools are not so hot, but I use the Tor bundle for anonymous surfing.