Using Justin's calculations (the best, Jerry, the best) as of August 3rd games, here are your MVRs (Most Valuable Rays).  Position players are judged by their offensive production, position, and fielding relative to position.  Pitchers are judged by their innings, estimated leverage, and quality of innings (using a fielding-independent ERA like number.)  All data are park and league adjusted and represent runs above a replacement player.

Value    Name
38    Longoria
33    Shields
30    Upton
29    Sonnanstine
27    Kazmir
21    Garza
19    Iwamura
17    Crawford
16    Navarro
15    Hinske
13    Balfour
12    Pena
11    Jackson
8    Aybar
8    Howell
5    Gross
4    Riggans
4    Bartlett
3    Floyd
2    Miller
2    Birkins
1    DiFelice
1    Reyes
1    Zobrist
1    Wheeler
0    Ruggiano
0    Ryu
0    Glover
0    Dohmann
0    Cannizaro
-1    Gomes
-2    Haynes
-2    Hammel
-2    Brignac
-2    Niemann
-3    Johnson
-6    Percival

If some of those pitcher numbers look weird, it's probably because Justin rates pitchers on their skills shown, not their actual ERAs.  Here are the fielding-independent ERAs as calculated by Justin:

FIP    Name
1.66    Balfour
3.16    Birkins
3.17    Kazmir
3.57    Howell
3.62    Shields
3.67    Sonnanstine
3.83    Ryu
4.03    Miller
4.13    Garza
4.13    Reyes
4.46    Wheeler
4.60    Glover
4.64    Dohmann
4.80    Jackson
4.92    Hammel
5.17    Percival
7.94    Niemann

When you see me ranting about Wheeler and Percival not being as good as their ERAs or why Sonnanstine is a better starter than EJax, this is why.  If you don't buy fielding-independent ERAs, then I'd like you to please explain why EJax, Sonny, JP Howell, and Shawn Camp have good ERAs this year and didn't last year.