I think I first heard this on Grey’s Anatomy but a friend of mine reminded me of it about 6 months back when we were hanging out in the park one sunny summer’s afternoon…

The Postal Service – Such Great Heights

Upbeat electro pop – here’re their MySpace and Last.fm pages.

If you’re more into acoustic and mellow, Iron & Wine also did a version which is featured on the ‘Garden State’ soundtrack and has a completely different vibe.