STALKER: Clear Sky for £10

Bioshock for £3.

Every ID game (all of the Quakes and all of the Dooms) for £20.

Portal for £3.

All of the Warhammer: Dawn of War games for £15.

Every Unreal game (the series, not the engine) for £10.

Every Valve game for £40.

And some really retro classics for £1.

I'm thinking of picking up all of the Unreal games, mainly for the Tournament games (and their modding community), and STALKER - which I've always contemplated buying but never bothered because of the £20 price-tag.

So get on down to Steam... well you don't actually have to go down any where; it can all be done with a mouse and keyboard!

PS. The only real drawback to this is that Steam in the UK is now in Pound Sterling - a move made because of the ever declining dollar.