Google URL Shortening Open with Analytics
Google opens up its URL Shrinking to the public and adds detailed analytics to URL's so you can so where the clicks are coming from.
HootSuite Offers New URL Shrink Option
Hootsuite has always used ow.ly to shrink URL's and provide a toolbar at the top, now Ow.ly changes to a URL redirect and ht.ly is the toolbar URL shrink.