Old steel hardtail mountain bikes like your Trek are still really prized by commuters and some intelligent bike folks. People who are in the know snap them up when they come up on Craigslist--too often someone will think that just because it's old that it's no longer worth keeping around. Since yours is still in good condition and is well-cared for, good thing you didn't make that mistake!

BTW, I would consider commuting on your Trek. You could put on some slick tires to increase your speed.