Subject says it all. I have a couple 8.0.0rc3 databases (about
1/2TB of GIS data and am upgrading to 8.0.0. Note that I'll
dump&restore when PostGIS gets out of the release-candidate
cycle. If I don't need an initdb I'll probably go to 8.0.0
now. If I do need one I'd try keep running 8.0.0rc3 until
PostGIS 1.0 launches.
(unless someone here has better advice)