I just got Steam today. I own an ATI graphics card, so I got the Half-Life Deathmatch and HL:Lost Coast for free.
They are downloading as we speak.
However, I have good things to say about Steam's interface--the friends, store, etc. Like Sarge said, it's cheaper to buy games from Steam, and I like the fact that it has it's own chat.
Excellent download for you PC game lovers.
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