That's what I am doing now, favors for whatever the owner of the computer in question wants to donate.
I just got a Compaq Presario 900 notebook for fixing one of my buddie's family computers. Too bad it has a busted screen which will need replacing
The owner of a Dunkin Donuts store that I (sadly) used to work at paid me 70 dollars to fix 2 store computers that were infected with spyware.
And a boss of mine at work is paying me 40 dollars for a mess of a computer that I just did my best to fix.
It's not much, but since I am not certified and don't have a degree (yet) it's the best I can do.