I dont really like the idea. And plus, I just got my signature privledges taken away for a month by the powers that be... Go me!
I honestly cannot think of a single computer problem that, in order to help me fix it, requires the knowledge of what is in the computer. This is not a programmers forum, where something like that might be necessary.
People here post their spec in their signature as a way to show off what they have. It's like a car and Myspace. If you have a nice car that you are pround of you are going to take pictures of it and post them on Myspace. But, if your car is a P.O.S. then you are not going to take pictures of it and show it off. Same principle applys here, if you aren't proud of your machine, than you arent going to want to tell people about it. Some peopel dont have alot of money, and some dont custom build their rig, and from the knowledge of the general populace around here, anyone would chastize anyone. People would hate on anyone with an eMachine, Dell, Gateway, and anything else that wasntt accepted around here as the correct hardware to have. It would lead to fights and flames. And plus, signatures are where we are allowed to be "Creative" and if they were taken up with crap about our computer, how could we put stuff pertaining to the ridiculous control-freak dogs that are around here?