re: What do you do to dispose of old Computers?

What are the specs of the PC? If they are reasonable, you should donate it at least to Goodwill rather than give it to some retailer to turn around and resell, especially best buy. And please just use a secure erase program to wipe the drive. There is no reason to destroy a hard drive out of unfounded paranoia. A single pass would be all it would take unless you're hiding illegal shite from the feds.