Well i happend to strip the motor mount bolt. Anybody got any tips on how to get it off?
thanks
rich

how much clearance do you have? Did you strip the head or the threads?

i stripped the gripping points on the nut

we have the car to where the front tires are off the ground.

If you haven't tried any penetrating oil (like Kroil or PB Blaster, NOT WD-40), I'd apply a bit of that first, tap the nut/bolt, and apply some more penetrating oil after an hour or two. Also, prepare by getting a replacement nut or two (or bolt, if you misspoke) of the correct strength grade (probably from the dealer).
To get the nut off, one thing that people sometimes have success with is hammering/jamming a slightly-too-small "throwaway" socket onto the nut, then using a breaker bar to loosen it. I'm assuming that vise-grips have already been tried and haven't worked.
To prevent future rounding-off, be sure to use 6-pt sockets in the future in these types of cases.

If all else fails Sears (among others) sells a set of nut removers - sort of like inside out screw extractors :) Not super cheap, but better than digging a deeper hole ;)