The competition (aimed at developers) opened at 5:30pm, so in likelihood all copies are gone by now - but worth a try, no? ;) It didn't seem to have very much publicity for some reason, which is only a good thing :)
I've made my entry already and I'll let you know if I actually get anything :P
Alternatively if you are a UK student you can now get licences for the Vista Business Upgrade and Office 2007 at "reasonable" prices from the Student Select program (they for some reason don't have the actual CDs yet though!)