Buy Underworld, Get Legends Free
Being a harbinger of great deals is often rare, but Steam does it two times at once!
First up, those who pre-purchase Tomb Raider: Underworld through the service will receive an entirely free copy of Tomb Raider: Legend to play in the meantime. You can also give it to a friend if you already own a copy of the game.
Secondly, Valve has released a “Valve Complete Pack” that offers the entire Valve catalog – including Left 4 Dead – for merely $99.99. This is a huge deal, as Left 4 Dead alone is $49.99, and the pack also includes all the Half-Lifes, Team Fortresses and other titles the studio has released over the years.