We have a linux graphics lab which doubles as a cluster. We've just upgraded to RH8.0 from RH7.3. Under 7.3 I used ifc 6 and icc 6 for compiling MPICH.
I've been using ifc 7.0 on RH8.0 on my personal desktop for my Fortran 95 molecular dynamics code. Although I dont think RH8.0 is officially supported yet for ifc 7 it seems to work well for me, and a recent build seemed to have fixed the problem using the debugger. ifc 7 gave a significant performance boost (around 20-30%) over ifc 6 for my application.
There are features in RH8.0 which are a real win for me (antialiased fonts in particular). I'm hoping to compile MPICH on RH8.0 with the 7.0 compilers with the f90 stuff enabled rsn.
So my vote is for support for RH8.0 (with 8.1 supposedly RSN) for the vtune and the compilers ...