www.gametap.com/launch
It sort of like the old Sega Channel except that it features about 300 games and from several different platforms and you can play them all on your pc.
I was most intrigued by the fact there are Dreamcast games in the video, myself. I made out Crazy Taxi and Ecco; the first one I know has a PC port, but Ecco?...
The Wikipedia article also says the Saturn's on there, but being a Wikipedia user, I know that if it sounds farfetched enough that it could be fake, often times, unless a source says otherwise, it is.
Anywho. Won't be trying it out, simply because I don't feel I can afford to. That's $15-20 a month I could be spending on more important things...
While I'm not sure whether I will sign up to this yet (a UK version ( format along side the address details and whatnot) would be useful, but probably cost more) I think this might be a good idea, especially as the have sme rare treats like Knuckles Chaotix and Tails Adventure. I'll keep an eye on it for now, but it looks good to me.