As for independent PC Light cycles, there is a very rare and old win-lite-cycle game called Cyclotron. It plays too fast for todays systems, but it still fun... I'm not sure, but I think it's the first 3D FPS light Cyc game ever made... but I could be wrong.
If you think it's woth it and can't find it on the net, just let me know and I'll send it your way.
my @mail addy is: firstname.lastname@example.org