I don't mean to sound rude, but did you check the clutch fluid level? I thought mine was going about 2 months ago..... then I remembered our cars have hydraulic clutches and checked the fluid level...... sure enough, it was just a little low (still a little in the reservoir), but enough to seem like it was slipping too early. I filled it up, and the clutch feels and performs like new. You may want to check that (if you haven't).

BTW, I have 96k on the odometer and my clutch is still good. How many miles do you have?