First off, Merry Christmas and Happy Hanukkah!
I was going to look at this myself, but I was beaten to the punch. PECOTA is the best for hitters, and ZiPS is the best for pitchers (although none of the pitching projections are really that good). PECOTAs are only available in the Baseball Prospectus 2007 book or on the BP website. Both cost money so I can't post them here. The 2007 ZiPS projections can be found here.
PECOTA .736 (or 73.6% accurate, for the 2006 projections)
BIS/Bill James .685
Prior YearFIP .370
Prior Year .290
Thanks to 'DSzymborski.'