Did u miss the entire "how much does it weigh" thread?
http://s197forum.com/forum/showthread.php?t=13162
Unless you're willing to drop serious coin and lose most of the creature comforts there isn't a lot of weight to shed. If you dont mind losing some comforts, you could remove all the seats, replace the driver seat with a cheap sparco (incredibly light and uncomfortable). Remove the stereo speakers and head unit, spare tire and equipment, door panels and side mirrors. Relocate the battery to the trunk so that weight is helping instead of doing nothing.
Beyond that you're talking about getting into material replacement (fiberglass or carbon fiber) hood/trunk lid, fenders, bumpers, remove the side skirts, buy light-weight race wheels (not practical for the street) ABS delete, AC delete, header side dumps and remove exhaust piping, tubular K-member, control arms both front and rear in aftermarket tubular design, aerospace brake calipers/rotors, safety glass removal in place of plexiglass.
So the question is how far do you need/want to go? 50-100lbs is do-able without getting hardcore. 100lbs+ is where things get "racecar".