I used to be sentimental with my old parts as well... Good stuff that I paid a TON of money to get, but finally one day I laid it all out on a table at my yard sale.
Some dude came along and I told him he could have everything on the table for $50. He freaked and backed up his truck... I just smiled. 386, 486, Pentium, 13" monitors, 4 MB video cards, MB RAM sticks, all gone...
I probably gave away $5K worth of stuff that day, but obsolete is obsolete.
I don't even like surfing on my current machine. It struggles to keep up with the latest virus software, IE, and Outlook. Can't wait to run my new build. The old one will go to grandma, for email. She doesn't know fast...
I don't have room to be sentimental anymore. When I moved last time, I ended up dumping another 5 machines, even my first Midwest Micro case that I was keeping for old timesake. They went out with the trash.
We ought to recycle our old computers -- too much good stuff going into landfills, but until someone makes it a viable enterprise, most will end up as fill.