The easy answer is to check to see how much the machines are selling for on eBay. If it's more than $50 or so, then it's probably worth your while to try and sell them, or if that's too much trouble, donate to your local Salvation Army, Computers for Schools, etc. Put up an ad on your local Craigslist forum with "FREE iMacs and PowerBooks" and see how quickly someone will snap them up. Heck, put them out at the end of the driveway with "FREE" written on a sign and watch them get snapped up.
If she had lived in my neighborhood, for example, and I knew that these Macs were being disposed of, right off the top of my head I can think of a bunch of uses for computers like those:
- I'd happily take a low-power Mac as a media server in my basement, and/or for a basic MIDI interface computer for the studio room.
- I have a friend who is a single mom with two teenage girls, they are all sharing the use of one iMac (probably just as old as those ones) and would be eternally grateful for another one so they're not always fighting over it.
- My church runs a kids' program and they collect computers of various kinds both for kids to play with and to take apart/upgrade (the latter is more on the PC side than for Macs)
- A summer camp I volunteer for could use more Macs to run basic iMovie projects for the "movie making" activity we teach, as well as for basic office administration work, database access, and a basic desktop publishing client for the daily camp newspaper. Their existing machine is a G4 eMac which everyone has to fight over.
- Before I bought a netbook, my PowerBook served that purpose after it became too slow to be my main machine.
I mean, think about it. Eight years old was 2002. We were surfing the web, buying things online, watching Flash videos, editing videos, running Word, and listening to iTunes in 2002. So these machines can still do all those things today. Maybe they won't run Snow Leopard or iLife '11, but those older apps still work.
Oh well...