Steve, I help a variety of my friends with their computers. I'm a PC techie and like any smart PC techie I use a Mac. Lately I have set up three Dual USB 500mhz iBooks with Tiger and I have found the the problem comes down to the fact that the 10gig hard drive is too small. So I have re-installed Panther on these systems. Using Tiger they become too hinky. Tiger with just a few basic apps takes up a lot of room on a small hard drive. Once these computers have more elbow room they work very well. So either stick with Panther or get a larger drive. Just my opinion. For what its worth. Bill