Spyder 2 Pro is expensive (About $800 although on sale now for $369), but have a look at the Pantone Huey ($99) or Huey Pro ($189).
Australian Supplier is here:
http://www.ausmedia.com.au/pantone-huey_calibration.htm
I have the standard Huey (got it about 1-2 years ago). Have been looking to justify the new one (it has multiple monitor support apparently, which would help as I can't get my LCD and CRT to quite match each other)
I love free stuff as much as the next guy, but $99 isn't too much to ask when you're image editing something you put hours of pain in to capturing it, only to realise that because you haven't calibrated your monitor that you've clipped an image or worse, dragged out too much noise because you didn't notice it.
Turbo