Join Date: Sep 2001
Location: Faversham, Kent, UK
Some parts are compatible. Seat posts might be a different size which as well as a new seatpost might mean a new front derailleur. You'll probably be okay with wheels, brakes, shifters and rear mech. I don't know about your stem and bars or bottom-bracket and chainset.
Most companies sell frames separately, but you might well be better off buying a whole new bike.
Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)