Surely you’ve seen the shortened url’s starting to pop all of the internet.  Services like Twitter, Plurk, Friendfeed and several other social media websites use these shortened URL’s to stay within the maximum characters allowed per post.  Do you really know what you’re clicking on?  Check out this Firefox script that will reveal the real link before you click on it.  I’ll save you the guess work on this link: //userscripts.org/scripts/show/40582