Nice to be getting the Lego out of the cupboard again after a long break.
Feels like everyone will probably know this, but I haven't found it documented anywhere so I thought I'd mention it: I've just discovered that if you capture an image in NXTCamView (the software for the NXTCam) and then press control-s it will save a copy of the image as a png.
Really useful for me as I want to calibrate it. May be useful for someone else as well.
Matt
EDIT: Or, you could always use file->save as... apparently it's been staring me in the face the whole time.

Ah well. Nice to be back!