Although there is only a smaller list of games right now, there's tons of room for expansion. I'm pretty sure if a game has enough support behind it (and people who want to play it) that it won't take long to add it to the list.

When OnLive is realeased from Beta testing, I'm sure that their will be a large increase in the games avaliable to play, as just now they are only testing, so they cant say that they have gotten OnLive to work 100% perfect.

Almost nothing works 100% perfect, but if it's far enough in development to throw it into Beta, they would have to show that it works most of the time. I'm not sure that as soon as it hits post-beta that there will be a large increase in games, but a faster increase of games as it catches on with the gaming community.