Like most everyone here, I'm partial to Steam, most likely for the simple sake that I've been using the client for years now, long before anyone else jumped on the bandwagon. But man, there just seems to be so many knockoffs nowadays. It's getting hard to tell which is which, much less whether one might be a mandatory client (has to be running to play a game) or simply something used for organization and/or purchasing & downloading.

Origin seems to be the other "big boy" on the block, and if visible feedback is any indication has what appears to be a 90% hate/10% love thing going on with users (mostly due to EA, and only slightly due to Origin being buggy).

GMG has their Capsule client, but I don't know much about it. I've begun seeing some sort of generic client being re-branded for use on various sites, but obviously still the same program. Desura, of course, but I'm not entirely sure if that counts. lol

GameFly freaked me out the other day. Got Bad Company 2 from them, only to discover that I needed their client to download it! Fortunately the game installs and plays without the client, if desired, so no biggie there. Hope all their games are like that.

So, what clients do you like/use/know of, and what are your opinions of them? If you're anything like me you've already got Steam and simply don't want to start using others, even if they're decent. Wouldn't it be cool, though, if someone created a multi-client similar to how Trillian did for ICQ/AIM/MSN, etc, so you could sign-in to all such services from a single client? Now that would be cool as hell.