Steam hits the 65 million user milestone.
Steam hits 65 million users - GameSpot
And just to copy and paste my comment from there:
I hated Steam at first because I couldn't sell my copy of Half-Life 2 when I was done with it. I don't have a very large income, so selling or trading in games is a big thing for me. So that HL2 sat on my shelf or in a drawer for years.
I don't remember when Steam won me over, but I think it was around the time of the Orange Box (the HL2: Episode 2 collection that include HL2, Ep 1, Ep 2, and Portal) and that I could just download the again instead of digging out the disc. I was also allowed to give my copy of HL2 away (the one previously mentioned) to a friend.
And then the sales. OH the sales. Their first big Christmas holiday sale, I think I bought 10 or more games for around $20. It was insane.
The one thing I like about Steam the most is that I can carry over my games from computer to computer. Since I've started using it more, I've gone through about three or four computers (for various reasons, not just to upgrade). I've been able to carry over my Steam account to each one, keeping all my digital games.
And yet, Sony won't allow me to do the same when I move from the PS3 to the PS4. This bothers me because I do have a great deal of digital games through PSN, such as anything by Telltale and Double Fine or an assortment of other indie games. Honestly, I thought about pre-ordering a PS4, but when it was announced that I couldn't carry those digital games over? I didn't.
I love digital games on PC not just for the fact I can carry it over from PC to PC. There are a LOT of other options than Steam, like GoG, that offer their own sales and advantages (like no DRM in GoG's case). I think that lack of competition is part of the reason PSN and XBox Live have struggled with their digital sales - at least in comparison with Steams' success.