I have successfully installed the trial version of BasICColor Display 4.1.15 and calibrated my MacBook Pro 17" Unibody and an external Sony LCD monitor under Snow Leopard. You can go to their site at http://basiccolor.de/english/index_E.htm
Download the 14 day trial and give it a try. I used the Spyder3 calibrator, but the Eye-One is also supported.
basICColor display v4.1.15 (Monitor-Calibration and Profiling) - 08.09.2009
... new calibration algorithm (CIECAM02),
....automatic hardware adjustment of JUST viewing booth via software,
....Universal Application (Mac with Intel processors support),
....Colorvision Spyder 3 support
....support for Mac OS X Snow Leopard (10.6)