These words don't often come out of my mouth, because I hate advertising.
But this really is a clever banner:
It's for VW and ties in with their branding efforts and what they are doing on Facebook.
You enter your Twitter handle and they'll analyze your tweets to recommend a vehicle that would fit your lifestyle. Personally I could care less for my result, the GTi (because it's horribly wrong), but it's a great way to get you to interact.
Although I think they should've added some kind of social tagging at the end, it's a great idea.
check it out here: http://caseyshultz.com/vw-ad.php