The iBook in question is a 1.2GHz, 12-inch model that Apple was kind enough to send me as a PR review unit since I'm doing quite a bit of coverage of portables and haven't had much experience with new-generation iBooks. As a long-time PowerBook user/owner -- my current PowerBook G4/500 has been a workhorse for three years now -- I'm intrigued but the possibility that I could switch to something smaller and, yet, more powerful than anything I've had on my desk on a regular basis.
The iBook is small -- I'm struck by that anytime I swing back to my PowerBook, which sits up on my desk on a neat little Ikea shelf that's connected to my computer desk -- you'd have to see it, but it enables me to use the PowerBook as a desktop, will a full-sized keyboard and mouse. The little swivel shelf brings the height of the PowerBook higher so that my ergonomics are a little better. Compared to the iBook, the PowerBook's 15-inch display looks enormous, if much less bright.
The other quibble -- and it took me a while to figure this out -- the trackpad on the iBook is too big. Seems an odd thing to say since everything about the iBook is small, but the problem is that the trackpad is just large enough that I end up with a second finger (my middle finger) often poised just on the edge of the trackpad and, if I accidentally touch the trackpad with both fingers, the mouse pointer goes shooting off wildly. I've never had that problem before with a PowerBook, and it took me a while to stop simply blaming the iBook for having a "cheaper" mechanism. That may or may not be the case, but it's the size that's the problem. (The trackpad button is also a little "clunkier" than my PowerBook's, but it works fine.)
Aside from that, the iBook is a wonder to me. It's definitely easier to pull in and out of my bag, it's got AirPort Extreme built in (something I'm not used to with my PowerBook) and Bluetooth, which I haven't yet used -- although I just remembered that I have a Bluetooth headset hanging out in a box around here somewhere. Hmm.
One of the most amazing little details to me is burning CDs from a portable. Like I said, I've had my PowerBook -- with a CD/DVD reader only -- for a long time. I'm used to thinking that burning is something that desktops do, then you transfer to your portable. Having this little iBook whir up and start burning a CD was fun to watch.
I find myself squinting at the screen a bit and, for the first time ever, I set a Microsoft Word document to 125% to see the text (something I always used to make fun of PC owners for doing because their display resolutions had no relationship to WYSIWYG sizing the way Macs, er, used to). But overall it's a fun, powerful little package and I like that it feels a bit more rugged than my PowerBook ever has.
I don't know yet if I can live with the 12-inch display and the trackpad drives me a little nuts, but after this little loaner period, I may just find myself with a new 14-inch iBook G4 as my next generation desktop replacement. Stay tuned.