Adobe are giving away Photoshop and CS2 free of charge - you have to register, but that's it. Right now the site is either snowed under or down, so it may be best to wait a day or two. Full details are here:
http://gizmodo.com/5973730/grab-photoshop-and-cs2-for-absolutely-free-right-here The Mac version, incidentally, is for PowerPC chipsets, not Intel.