The "Release Candidate" for Ubuntu 6.06 LTS (aka. Dapper Drake) got announced today, but along with it I found a nice little tidbit in the announcement:
* Because this is the Release Candidate, you need to invoke the
update manager explicitly. To do this, press Alt-F2 (or open
a Terminal using Applications -> Accessories ->Terminal)
gksudo "update-manager -d"
This step will not be necessary on the final release.
I've bolded the important part for clarity.
Things just keep getting better and better...