As of Wednesday morning, March 28th.

RPI Rank - School (Div-I Wins and Losses and Big-12 record)
3   Texas (23-8, 5-1)
11 Texas A&M (23-5, 3-3)
15 Oklahoma (20-7, 2-1)
32 Missouri (20-7, 2-1)
35 Kansas State (18-7, 1-2)
45 Baylor (16-11, 2-4)
47 Nebraska (14-9, 2-4)
59 Texas Tech (19-10, 3-3)
123 Oklahoma State (19-6, 2-1) ?Why this ranking?
131 Kansas (13-15, 2-4)

We are now at about the half way mark of the season so these rankings are becoming meaningful.  For the complete list just visit Boyd's World College Baseball Ratings Page

For a good run down of this week's Big-12 baseball action no better place to go than Corn Nation.  A Nebraska blog with very good baseball coverage.