From ImprezedRS's list:
Light weight bumper beams - thinking about it
Remove metal Knee beams in dash
Coilovers( saved about 5 lbs each corner)
Removed everthing in trunk - done
13.5 lb battery - on my list
removed rear spoiler - never had one
Morette headlight conversion(not much weight saved here)
Removed Tar from back of car to the back seat(got to tired to do the rest) - done
Removed Rear speakers - done
Lighter front speakers and Cd player
Removed Windshield Washer Fluid Tank(not that heavy without water in it) - I like a clean windshield
Aluminum 4POT Subaru Calipers(just found out last night they where aluminum)
ImprezedRS - did you weigh your car before and after you removed/replaced parts, or are you estimating?
The stuff on your list that I've also done has taken about 50 lbs off my car - so the other things that I haven't done yet will take off ~250 lbs?