Sorry, I meant there was no RPM for the actual drivers yet. My system already had rpmbuild on it (I did a Workstation Install), but I was getting compile errors building the SRPM...
I then found a built RPM for the previous release (0246, I think) which is network-only, made by a guy called Pheran on the nForcersHQ.com forum. This worked just fine to get the network going.
As for sound, it seems to play the Red Hat test sound fine, but I don't get any sound from (eg.) TuxRacer, so maybe that's a different thing which the proper driver will fix when NV get around to releasing it (or fixing the SRPM)
Sorry for the confusion...