Beyond the Box Score has a post up introducing what they call JustVORP (presumably named after the guy who designed it, whose name is Justin), which aims to correct some of the problems with VORP.
It's pretty interesting - I didn't realize the strange way that replacement level is calculated in regular VORP. The level is set by taking a percentage of the average offensive production at each position, which is an unfortunate choice because DHs on average hit worse than 1B-men, making it seem as if DH is a more difficult defensive position.
The JustVORP stat uses the defensive spectrum of DH-1B-....-SS-CA, and the associated adjustments. Also, it claims to correct for both park and league differences.
I'm not sure what correcting for league differences means. Judging by the results, it sounds like they established a separate replacement level for each league, which is lower in the NL. I say this because the top of the rankings are full of NL players. There are only three AL players in the overall top 10, and that's if you count Manny Ramirez (not sure how they dealt with him).
Also, the list shines pretty favorably on a couple of Orioles - here is the top of the AL rankings (not including Ramirez/Teixeira, who scored 68/53 respectively):
1. Sizemore - 66
2. A-Rod - 62
3. Mauer - 54
4. Pedroia - 53
5. Roberts - 52
5. Markakis - 52
