I have a G3 iMac I'm giving to a friend; it's the Blue Dalmatian one in my signature, which contains the pertinent specs. It's only really going to be used for running Mail.app, Safari, Address Book, iPhoto '05, iTunes, Microsoft Word and Powerpoint and Adium. My friend isn't particularly tech-savvy, so I doubt she'd do much else with it.
It's running Tiger, fully updated, and it does so very satisfyingly. I'm sure several of you will recommend I downgrade to Panther, but I think Tiger is the better OS, and as such is staying. I was discussing OSX with a friend, and they said they'd got a noticeable performance boost by disabling background items that weren't used--iSight drivers being the example used.
Unfortunately, I don't know how to do that. Any suggestions? Ideally, if at all possible, I'd like to pare the background items back to only what is needed by the OS to run happily with the above programs. So, OSX experts, how do I do this? You input is much appreciated.