I’ve updated CUPS in Fedora devel to the 1.3b1 beta package. The cups-1.3-0.b1.2.fc8 build has support for Kerberos and DNS-SD (Bonjour/Zeroconf). The most recent build of selinux-policy is needed to get zeroconf working.
$ avahi-browse --terminate _ipp._tcp + eth1 IPv4 HEWLETT-PACKARD DESKJET 990C (HAL) @ hoopoe.elk Internet Printer local
Also: there is now a Fedora package (under review) for the CUPS driver development kit. I’ve been meaning to package this for a while, and finally got to it this morning.