A slipper clutch is a clutch that does exactly as the name implies. If you downshift too early it slips the clutch plate so that the engine braking doesn't lock up the rear wheel. It allows you to concentrate more on the task at hand. /images/icons/wink.gif
This is the same thing that Punk said, but i'll be damned if i didn't just spend 20 minutes learning how to cut and paste, and
not use it!!!!! A slipper clutch is basically a one way clutch. It grips or holds when you are accelerating and slips when you roll off the throttle so the engine braking doesn't cause the rear wheel to lock-up. (This was an answer given to me by redtwin, in another forum.)
I could have used a slipper clutch once. I was on a straight and wanted to shift up but my foot decided to shift down locking up the back wheel for a second. LOL Scared the crap out of me. /images/icons/laugh.gif
The most common types of slippers are usually one of two different types... one has ball bearings that ride on "ramps." When a deaccelerating force is felt the pressure plate riding on the ball bearings is thrown out, allowing the clutch plates to slip. The other works the same way...just without the ball bearings...
A slipper isn't any harder to maintain than the stock unit. Other than the intitial purchase ($800-$1500), it isn't any more expensive for maintenace. I think the discs are about $200... about $20 more for AL plates. There are several production bikes that come standard with slippers, (Aprilia, TL's...) so I don't think that wearing out faster than a normal clutch is really that big of a factor.