Bike Weight Reduction: Which Parts Offer the Biggest Gram Savings?

Question
I'm spending some money trying to save grams to my old bike (stumpjumper 2001)

can you tell me, what are the heaviest parts do I must start to change ? (the fork, rims, etc.)

Or, normally what are the parts I have to change first, to achieve less weight faster?. Forget brands and models.

Answer
Hey whats going on? Well, if I were you I would start with handlebars, stems seats and seat posts. See how many grams you can take off there then move on to bigger things. When I say bigger things  mean like wheel sets and forks. After all is done I would start looking at derailrs and techinal stuff. Also don't buy anythign that will compromise the weight of another part. Msure it all works out. Okay, I hope I helped you. Bye.