Xbox 360 Wire has a list of 50 games that deserve to appear on Xbox Live Arcade, although it does say that any other downloadable console versions would also be welcomed.
"The list covers titles from way back in the BBC Micro day's right through to some of the latter consoles. Hell, there's even a couple of arcade and web based titles in there too...
All of the games listed here are entirely possible to bring back today. Certain first party titles had to be excluded due to either publishing or legal reasons - you won't be finding Mario Kart on XBLA any time soon I'd wager.
Where a title was released on multiple platforms, the preferred 'version' is the console named in brackets after each entry. Each entry has a 'plausibility rating' out of 10."