The only thing I know about clamshell iBooks is that I want one real bad and they look awesome. I'm about to buy one from a guy who lives locally but before I do I have some questions: It doesn't have any OS on it, so which should I choose? I've read that it shipped with 8.6 but with the correct upgrades it can run 10.3.9. Does anyone have experience with this? I would prefer to run 10.3.9 if it will work well, but I would certainly rather use an older OS if it will run considerably smoother. It has a 300MHz G3 processor, 64MB memory, 6GB hard drive, CD-ROM drive. The upgrades I'm going to do is the memory and hard drive, obviously. I saw on macsales.com that I can put 512MB of RAM in it and a 120GB hdd, which I will do instantly. Is there any way to upgrade the optical drive? Also, back to the OS, when I decide on one, how do I acquire it? Is there somewhere I can buy old versions of Mac OS? I know I can handle the upgrading itself, it's just a matter of making sure I can secure an OS on it when I'm done. Thanks for any information you have.