still, the 12" PowerBook is smaller in every dimension compared to the iBook 12", so if you compare them directly, you'll see something you mightn't noticed if you look at them separately: The PowerBook 12" will look leaner. More slimlined. And, of course, more professional. Also, you don't have to hack it to get monitor spanning.
Also: Better graphics card, better processor, same battery life. I wonder how hot it really gets, but this is one sexy PowerBook and certainly a good addition. I might still choose the iBook for price reasons, but that baby has put me to awe, as it's basically what I've wanted since I've bought the TiBook 500...