First computer game... Hmmm, there was a Peanuts/Charlie Brown learning game thingy my Dad bought me when I was in first grade for our Mac. It was pretty awesome
I think the first -real- game I got in to would have been Diablo in third grade. My friend got the game, and I probably played it more than him for a few weeks. My father got a shiny new IBM in forth grade, and I finally got the game for myself (along with Command & Conquer: Red Alert). I think I saved like a year's worth of allowance for both those games... Damn!
Then StarCraft, and after than it was EverQuest. Oh, EverQuest, you changed my life... *starts to stare at the ceiling*