What parts can you scavenge from a nearly 3 year old MacBook Pro?
The memory and the hard drive are probably the easiest to remove and reuse. But there are plenty of parts that could be re-used including the keyboard, the display, optical drive and airport.

The site ifixit has a great guide to disassembling MacBook Pro machines.

If you do not have a need for the parts yourself, you may be able to sell them on eBay or elsewhere. I am not sure what the market is like for individual parts, but another option is to sell the machine as a whole on eBay stating that it is non-functioning and for parts. It would save you the trouble of disassembling it yourself.