I requested EPEL EL-4 and EL-5 tag and build for varnish on friday night. The packages will be included in the main EPEL repos at the next sync from testing, that is primo November. These packages are the same as we use in production, and should be quite ready for general usage. Packages are available at http://download.fedora.redhat.com/pub/epel/testing/ . There is a list of known bugs that will be fixed eventually in the 2.0 series at http://varnish.projects.linpro.no/wiki/TroubleLog
Please report any problems as tickets in Trac at http://varnish.projects.linpro.no/ (you’ll to register and login to file tickets). Bugs reported by RedHat’s Bugzilla will end up the same place over time, but we would prefer our the local ticket system.