Since he mentioned PSO:
PSO 2 is well underway, and so far from what I've seen of the Japan-only Alpha, it looks great. The combat has been heavily revamped even compared to the latest PSP PS titles. So for those who are PSO fans (I remember playing for hours on end online on my Dreamcast), you should keep an eye out for it. It's slated to be PC-only at this point, and seems to have pretty good support for KB+mouse as well as USB controllers (testers report that the wired 360 controller works quite well, for example). Not everything is implemented, but what they have so far seems to work quite well.