You might run into some problems if you attach other things to that hub at the same time. The hub itself will draw a small amount of power, and other things attached to that hub will also draw power.
I recommend that you sync/charge your iPod on one of the ports directly on the MacBook Pro-- each is full-power-- and use the hub for other, lower-power devices (USB thumb drive, mouse, etc).
Better yet, I recommend purchasing a USB hub that comes with a power adapter for full use at home, but can run on bus power in a pinch when you're on the go.