Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
I've got 10.4.10 running on my Tangerine ibook.
Only problem is the small amount of ram in the system, well that and the low rez screen.
These are still usefull machines for things for field work where you dont want to risk damage to a nicer laptop, I carry mine with me to offload pictures from my camera and to do GPS mapping with. I have even wardrived with it.
Add a 512MB stick. It'll help with performance. Apple's max RAM spec is incorrect - those iBooks can indeed work with 512MB.