Get the PowerBook - they are better for power users (as the name suggests) and are twice as sexy ;-).
G5 PowerBooks are apparently just around the corner, so it might be wise to wait. This is a situation faced when buying any technology however, so like usual, you just have to weigh up how soon you need it against how far off the newer version is.
Will.
Go with 1GB RAM as well. 512MB is a little bit tight for a developer.
CAS.
My ears are burning! Actually I have bought a Mac for Elias, sort of. I donated $400 to the LWJGL Mac Fund. He took delivery of the Mac yesterday so we should expect a stable port by Christmas. Hurrah!
Cas 
I had another question. I want to do some home video editing. How can I get video into the laptop? Is the Powerbook a better bet for that?
Dr. A>
Forget to ask about PowerBook GPU card differences -
GeForce5200 vs ATI Radeon 9700
The PB can come with either a 64 or 128 meg version of the 9700. Both GeF and ATI appear to have pixel shaders and such.
Any info on how openGL compliant they are? Either go up to the 1.5spec?
Dr. A>
[quote]Don’t worry about the linux/unix/*ix kernel under the Mac hood. As long as my wife doesn’t have to know its there and start using things such as: chmod, chgrp, ls, etc. We’ll all survive the conversion!
I enjoy harrassing the linux power users around here by saying ‘Well, time to get back to work and do some more cha-modding and cha-grouping.’
I haven’t stooped to saying linux using all the various mispronunciations. 
Anyway, back to Mac land. What’s my migration path looking like?
[/quote]
Awwww, what fun is that?!? Don’t you LIKE having to rebuild the kernel every time you do something major…like turning on 3D acceleration?
-Chris
[quote]I had another question. I want to do some home video editing. How can I get video into the laptop? Is the Powerbook a better bet for that?
[/quote]
Anything with a firewire (IEEE 1394) connector will be able to get video from a camera that has DV-out. The main thing is CPU speed and RAM for running the software.
Included with the Mac will be iMovie and iDVD* - iDVD is very well done, iMovie is a tad simple. I got Final Cut Express cheap and it is great.
*if you get a model with a “Superdrive”