Wait, what were you and your friends laughing about? That it's such a good game?
But anyway, yeah, Portal is a great game, both the flash version and the console version. Honestly, I like the 360 version over the others, just because I ended up getting stuck at one point in the flash version, but otherwise, they're both very fun and well-made games. I have a feeling it's becoming another cult game like Halo however, and there are lots of other great games that didn't get as much recognition. Braid is a good example.