Digg released their new DiggBar product, another URL shortening service which additionally gives you "digg stuff" in a toolbar when you go to the page with the short URL form.
Likes for me is as a digg user, it might make things more convenient. Dis-likes is that it keeps you "in" digg when you might not want it. URL shortening services should (IMHO) just do that, shorten the URL for easier twittering or facebooking, and when you click on the short URL, it takes you to the normal URL. This keeps you in the short URL and puts extra stuff on top that you might object to or you might not.
Interesting to see if the size of digg will give this more traction than the tons of other short-url services out there.