I'm reinstalling a website that used a pre beta version of OACS4.
Now I keep getting confused (or am I always just confused?), should I
download the named version and patch it (4.5b1), or download the
nightly tarball, or get the cvs version?
I would grab sources from CVS using the tag "oacs-4-5". This will get the head of the 4.5 branch, which includes bug fixes added after the beta tarball was made, and bug fixes which haven't hit the development branch yet.
When I cut the release I will merge branches and the development branch will be up-to-date bugfix-wise. This is one of the main reasons to try to push out a release ASAP.