I'm following the instructions in "How To Compile A Kernel - The CentOS Way". When I add anything to the General Setup ---> () Local Version, it won't build the RPM. I get "error: File /home/nemom/rpmbuild/SOURCES/kernel-3.0.0.tar.gz: No such file or directory". I put "-n01" in as the version, and it creates kernel-3.0.0_n01.tar.gz, then dies because it's looking for kernel-3.0.0.tar.gz. If I leave it blank, it works and creates an RPM (which I've installed and am running right now). But, this means there is no way for me to version the kernels I am building.
The tutorial is for 2.6 kernels - haven't tried that with 3.0 yet, so it's possible that things have changed.