BitLy

 bitly.el allows shortening URLs through the api the bit.ly service
 provides. See http://code.google.com/p/bitly-api/ for info about
 the tumblr.com api service.
 Installation:
 You will need to register with bit.ly and get an API key. Customize
 the variables bitly-username and bitly-api-key.
 Description:
 Interactive functions:
 bitly-shorten
     Shorten a URL (prompted for in the minibuffer) and insert at
     point. 

Lisp:bitly.el