While there have been some great Star Wars games mentioned in other threads which will be on this list, I wonder if anyone has played this (I'm sure you have Adamclark52)
This game is set right after Episode II and features a special squadron of 4 clone troopers. No jedi in this one, just pure first person shooting goodness. The difficulty level takes a huge spike at the end but all in all a very good shooter. I think my favorite part was exploring the empty Republic star cruiser, they got the creepy atmosphere down well.