According to Boyd's World conference ISR ratings, here are how the different NCAA baseball conferences rank.

Conference   Rating
Big-12         114.1
Pac-10          113.4
SEC              112.2
ACC              109.9
Big West        109.7
WCC             108.7
C-USA           108.2
MVC              106.5
Big-10           104.3
Sun Belt        103.6

The complete list and other information can be found at Boyd's World.  An excellent site for information about NCAA baseball.

It is a bit surprising to see the Big-12 ranked #1, and the Pac-10 #2.  Normally the SEC and ACC have the top two spots.  The Big-12 certainly is solid this year, with only Baylor and the Jayhawks having off years.