...that is, I figure that if Boycat's Mum was sent the following thing by email, everyone else has already seen it (my work keeps stuff like this out, so the fact that I haven't seen it means nothing). But just in case you haven't, these are really good, because the songs are cool as well as the videos:
Ok Go, "Here it Goes Again" ['Treadmill Dance']
This one wasn't sent around, but it is a more-immediately-catchy song:
Ok Go, "A Million Ways".
But both songs have been in my head since I first heard them.