It's a lot like the "what are all the spell changes in 3.5?" threads, the topic is just too large an area of inquiry. I'm certainly not interested in running through several hundred monsters just to compare CR's. The 3.5 SRD is up & online, and the 3.0 remains online over at the open gaming foundation, so if it's really important to you, just go over & do the legwork yourself. You'll be missing a few IP monsters (Beholder, yuan-ti, displacer beast) but it's all there.
I just don't think anyone wants to do your legwork for you.