Well it is important to know that the MBP is more than just a faster computer. Mine hasn't arrived yet :-( but...
1. The MBP is a much faster computer than the iBook.
2. iBook batter life will be better by an hour or so. I get a little over 4
hours on mine right now and I hear the MBP gets a little over 3.
3. MBP is obviously bigger right now. Its a 15" screen opposed to a 12". But
the MBP is thinner. MBP is 5.6 pounds. 12" iBook is 4.9 lbs. MBP is
actually not much heavier than the 12".
4. You get a superdrive. No superdrive in 12" iBook.
5. MBP comes with built-in iSight camera
6. MBP comes with Front Row software w/ remote
7. MBP = more RAM and more expandability
8. MBP = backlit keyboard
9. MBP = audio in jack
10. MBP = better graphics
11. MBP = much better screen
12. MBP = much better design
13. MBP = Gigabit Ethernet (10/100/1000)
iBook = "megabit" ethernet (10/100)
14. MBP = bigger and faster hard drive
MBP has a 5400 RPM hard drive while iBook only has a 4200 RPM hard
drive
15. MBP = DVI out
16. MBP = MagSafe Connector
17. MBP = way of the future
and much more...
It all depends on what you need, what kind of work you do on your computer, money you have to spend, and how much you need it. If you can wait, it might be a good idea, especially if you might want a new MacBook (Intel iBook) or a different version of the MacBook Pro. I have a 1.0 Ghz 12" iBook and I chose to upgrade to the MBP. But I do some video work and the iBook just wan't enough. Its hard to give any advice without knowing your situation. But the facts don't lie. The MBP is a great machine. More than just a faster computer when compared to the iBook.