Haha photo editor for traveling. Limited but it can do it. I have Logic Studio on my Mini but that has 4 gigs of ram. I would enjoy a mobile logic rig but it only has 756mb ram i believe. Garage seems the next best thing.
See? A tiny little bit more information and light starts to show at the end of the tunnel. NOW it's clear that:
• You can swap out your RAM for a 1Gb chip giving you 1.25Gb total which MAY be enough (I would think) to at least run a Logic "Lite" version as in just don't try to run a zillion tracks and instruments at once. That may work out fine as a "portable" setup.
• Failing that, GarageBand probably IS the next best thing since you can export GB stuff to Logic "when you get home" and they have similar workflows.
As for a photo editor, you can find CS3 sets or standalone Photoshop versions to run under Tiger for cheap. You have USB2 and a decent screen. Actually, the iBook would make a very good editing laptop.