I had mentioned a small bug in 0.9.0 that made us create 0.9.0.1 ISOs. The issue is related to renaming our conary label. It was conary.foresightlinux.com@fl:desktop, we renamed it foresight.rpath.org@fl:desktop. The ISO contained changesets with both labels. This causes problems updating past 0.9.0. To update 0.9.0 installations to the latest:
$ wget http://www.foresightlinux.com/downloads/rename-foresight-fix
$ cp /var/lib/conarydb/conarydb ~/conarydb.backup #backs up the db just in case :)
$ sudo python rename-foresight-fix
$ sudo conary update group-dist tomboy