Raiden Project, Raystorm, and the original non-DualShock non-Director's Cut Resident Evil are all controllable, and there are probably many more. In general older games are more likely to work - it seems to depend on if the developer upgraded to the newer libraries that support DualShock.
Oh, and to head this off at the pass: on latest, you will get static/nothing in place of CDDA in e.g. Darkstalkers (which is also controllable). I'm working on that one.
