NeoGaf member MikeB compiled a list of PS3 games that utilized the Cell Broadband Engine SPUs in games.
According to IBM the bulk of the PS3's processing power is located in Cell's SPEs. Without using them games development is very similar to developing a game on a decent specced single processor PC or Mac (so not really difficult at all like some developers claim, funnily those who do not even use the SPEs the porting process, it should then actually be pretty straight foward (with of course the advantage of being able to optimize for a single uniform configuration). PS3 exclusive devs who are using the SPEs claim it's not more difficult to develop for and that it's much easier to develop for than for the PS2. Considering more and more games start to utilize these SPEs MikeB thought it would be interesting to list those games and possibly deduct those which don't.