So, I think it's only fair that twitter users have the ability to see whether or not a link posted by someone they are following is an advertisement or not. This includes TwtAd ads. TinyURL is the main short url service used on Twitter and although they do have a feature you can use to see where a link redirects to before going to it, not a lot of people know about that.
I've developed Show TinyURL, a site you can use to find where a TinyURL link redirects to:
Show TinyURL - Show Where a TinyURL Redirects
I made the design of the site based around the design at TinyURL. I used all the same colors and worked around the simplicity of it, but gave it my own flavor.
I used AJAX to make it really simple to use
What do you think?