As you know probably, Portal 2 comes with a free licence for the PC version on Steam. I've always kept PCs for work and consoles for play, but with a less techy role these days I'm more inclined to play on my pretty Sony Vaio, which has a fair stab at running Portal 2 if you switch off the fancy rendering.
Steam is really nice, lots of bargains on there at the moment as well. Team Fortress 2 is free now too, result, downloading now. If you lot want to add me on Steam, it's psn_mrjimmy.