I've updated the position player pages with defensive projections. These are based on 4 years of TotalZone data, including minor league defensive ratings. I have not included catchers yet. The numbers tell you how many runs above/below average player should be for every position that he played at least a game in.
The infield numbers (excluding 1B) are dependent on each other - if a guy plays short and second his rating at short uses all infield data as an input. Outfielders are similarly lumped together. I use MLE's based on the work I presented here.
The numbers will disagree sometimes with previous defensive projections published on my site, the difference is input data used. Previously I used average Zone rating data.