Man, you know what I'd love to see on steam? Real games! Full games! Man, that would be fucking awesome!
OH, OH! I KNOW! What IF, and bear with me here, you could purchase your games online, fast and conveniently, maybe even have cheap prices and maybe, I'm dreaming but ok, have some temporary deals of some kind, considering they wouldn't have to deal with all the hassle of retail sales... They could even become sort of "patrons" of indie developers considering, once again, they totally bypass common retail problems...
The only way that could get better would be if you could link your games to some sort of an account... And then play them from ANYWHERE you signed on with it... That would... Woooohh man... Just... Wow... You know...
Oh wait.