For people who are interested in weight-reduction ideas for thier vehicle but don't want to "sift" through absolutely EVERYTHING out there (which I "sortof" did but don't hold me responsible for finding them all), below are some threads/posts from the various AFM forums.
Bon apettite.
If you want weight reduction ideas...
Front sway bar: 21 lbs
Front bumper: 24 lbs
Move battery to the trunk: 0 but moving a 50 lb box to the trunk improves traction
Replace steel hood with fiberglass hood: 15 lbs
Remove trunk/hatch carpet and sound deadener: 15 lbs
Remove tailpipes and install turn downs: 20 lbs
Remove rear seats and associated parts: 47 pounds
Remove front seats and replace with lightweight racing seats: 24 lbs
Replace steering rack with 1981 or older manual rack and remove power steering pump: 16 lbs
Remove rear sway bar: 14 lbs (racing only)
Replace front wheels & tires with lightweight skinnies: 32 lbs
Remove heater, stereo, speakers, under carpet padding, center console, misc. interior items: 63 lbs
Replace rear wheels & tires with lightweight wheels and slicks: 20 lbs
Remove spare tire & jack: 42 lbs
Remove exhaust from header collector back: 51 lbs (racing only)
Remove window mechanisms and side impact bracing within doors: 36 lbs
Replace iron heads with aluminum: 40 lbs
Replace radiator with aluminum: 15 lbs
Every hundred pounds is 1/10 or a second in the quarter - roughly one car length). It takes 10 horses to undercome every hundred pounds. You do the math. It is always cheaper for the car to diet than for you to add horses.
I never considered the spare/jack weighing 42lbs. Looks like its coming out, no need for it anyway.
While I agree that less weight is better, that extra 42 lbs. over the rear wheels isn't always a bad thing, especially on a traction challenged car. Better to start removing weight from the front and work your way back to gain more weight transfer.
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07 GT premium in Grabber Orange. 5spd. manual w/IUP, plenum cover,3.55's, Roush scoop, 14" antenna, C&L CAI, Bamachips 93 Predator tune, Steeda U/D pulleys, Hurst shifter, FRPP GTA's, CDC chin spoiler, CHE LCA, BMR panhard bar, Eibach Pro Kit. FRPP 17" black bullitts and 255R45 Firestones, Spydershaft aluminum driveshaft, MSD coils, D-Specs, Prothane motor mounts, BMR LCA brace, Steeda panhard brace, BMR adj. UCA, Webelectric sequentials, Mikronited FRPP 4.10's.
FYI: various "weight reduction" threads/posts 
