Just picked up a Spyder 3 and just can't seem to get the monitor calibrated. It's an LG Flatron, 22" connected through a DVI cable. Previously calibrated with an Eye One. Ran the software bundled with it and it finished the calibration with a distinctive green cast. Gamma was set at 2.2 and Luminance @ 100. Tried it a couple of times, uninstalling and re-installing, switch up USB ports etc...
Then loaded the demo version of Color Eyes and it still came through with a green cast, but not as bad. Looked at a couple of images in PS and oranges/pinks were garish and blues were way off.
Next step was to re-calibrate using the Eye One through Color Eyes and everything worked out great.
(And yes, the thought of returning the package and just getting the Spyder Print app has crossed my mind, not sure if I can though...)