I've done this several times.  My 700mhz g3 iMac is a fully featured machine, as far as I'm concerned. Especially since its maxed out in RAM.  OS9 has all you need, especially on the abandonware front.  The only place that its really lacking is with the web browser.  And even that is doable -with Classilla I can at least read most of the news sites I read, a lot of my forums (I haven't tried this one - yet), email is a cinch with gmail's HTML-based version, wikipedia loads well.  Thats why I've held onto the g3.  Good, working piece of hardware.