Can you smell the newer CentOS 5.1 cooking ?
I do : some of us are busy right now trying freshly rebuilt srpms that will be integrated in CentOS 5.1 ... Some new features announced Upstream seem interesting : to name a few : newer libvirt and xen packages (updated to 3.1.0) , cifs module updated to correct a known bug , some new added drivers (like the Areca ones) , and also the newly added iscsi-target feature (i'll test it as soon as it will be available for QA members ....).
The newer kernel corrects also a number of bugs, notably the vga= parameter that was not working anymore (why did they remove vesa_fb ?)
List is too long .. and no ETA yet for CentOS 5.1 ... but that won't be too long i hope ;-)