Francine: I concur with the others: OS 10.2.3 on the 366 graphite iBook SE runs fine. It is significantly slower than OS 9 (maybe 20-25% slower), but I¹ve gotten used to it. Also, it's much more stable than OS 9. Mine hasn't crashed at all under Jaguar. Others have said that 192 MB of RAM is sufficient, but that's what I had before I maxed it out at 320, and the additional MBs boosted the speed noticeably. However, 320 MB is probably the most you will need, and I doubt you will get any improvement in speed by adding more than 320, so no need to get a 512 chip (especially since a 512 is twice as expensive as a 256, and some have said that more than 320 uses too much electricity and reduces battery life significantly). I found a 256 MB chip for $45. One thing though: I do not consider it worthwhile to put a new hard drive or CD-RW drive in this computer because all the other hardware on this iBook is old and slow -- 66 MHz system bus, crappy 4 MB ATI graphics card (which does not make use of Quartz Extreme), etc. -- so spending a lot to upgrade the drives is a waste of money because: 1) any speed improvement from a faster drive will be negated by the 66 MHz system bus bottleneck; and 2) you'll almost certainly want a new laptop in a year or two (because your current one is so slow), so why spend more money on this one? Trust me on that last point -- I love OS X, but it's so slow, and the 12.1" LCD screen is so undersized in OS X (with 800x600 resolution, everything is bigger than it was under OS 9, therefore there is less useable screen space) that I cannot wait to buy a new laptop (at least a 15"). But alas, I cannot justify the expense at present, so I will wait and hope that Apple releases a G5 within the year (I know, wishful thinking). Another thing: the 6 GB drive (actually 5.6 GB) is too small to install both OS 9 and 10 and still have room for apps. I did this before, and there was only 1 GB of free space left after installing MS Office and a couple of browsers. So, when I got Jaguar, I zeroed out my HD and clean installed Jaguar (I strongly recommend a clean install) without installing OS 9. With all my applications on it I have around 2.5-3 GB of free space, which is sufficient for my purposes. However, this means you must invest in new OS X-native apps if you don't already have them. If you have any other questions about this, feel free to contact me off-list. Good Luck, Jay Boshara.