I currently own a 4+ year old clamshell iBook running OS 9 and will be buying a new iBook soon. So, I'm seeking recommendations on what kind of OS X primer/reference to buy...? I've used a friend's PB running OS X, so I know basic things, but I don't feel as comfortable as I do with OS 9 [it took me awhile to figure out how much RAM was being utilized, for example]. Also, I have some unix background, not so much in programming, but in basic use. I routinely use commands like "ls -lt | more" on my school unix acct, for example. Thanks for any suggestions!