http://www.gog.com/en/page/promo_ubisoft/
Good old DRM-free games!
I can definitely recommend BGE if you haven't played it before and like zelda-style adventure games. It's one of my all-time favorites, and I'll probably end up playing it again during the next week. If I recall correctly it got tons of good reviews, but the weird title combined with the unfortunate timing of the release resulted in it getting overlooked.
PoP: Sands of Time I sadly haven't played, though I played the sequel Warrior Within and that was a great fast-paced platformer.
Rayman I've never played, so that's the game series I'll be gambling on this weekend! I'm curious to see whether the gameplay has the same great feel of the rival games, like Mario. If anyone's played Rayman I'd love some input before I shop!