Okay, one more Portal 2 post:
Apperently thanks to the wonderful world of Vavle and Sony. If you buy Portal 2 for the PS3 you will get a free copy of Portal 2 for the PC/Mac. You will get STEAM cloud for both platforms and can play with any player regardless if they are on the PC or PS3. All you have to do is connect your PSN and STEAM accounts!
Read more here: