This is the latest Macbook from the November 1st refresh so it has the Santa Rosa chipset and slightly better integrated video.
Specs are:
2.2GHz Intel Core 2 Duo
2GB memory (2x 1GB)
160GB hard drive
Double-layer SuperDrive
OS:...
I noticed this on my M1330 too. It stays constantly in the 2.2 GHz area. I don't mind because it stays cool, but my M1210 would usually run at 1 GHz from its full speed of 2 GHz.