For anybody using the cassandra ubuntu stable release PPA, it is being updated right now to 0.7.0.
This is just a heads up. I'd expect anybody using it to still use all best practices from the cassandra documentation for upgrades, and not just blindly apt-get upgrade. But either way, this is a big change and worth noting. The 0.7.0 packages are, IMO, of much higher quality than the 0.6 packages. In addition to using system versions of java libraries where possible (allowing for updates/security fixes from the ubuntu teams to be applied), it runs the unit tests on the build, so there is at least a good chance of everything working. Recently Launchpad has started publishing stats for PPAs, and just as an FYI, there seem to be about 25 machines regularly subscribing to the PPA. I'd be interested in hearing any feedback from people who are using it, or who have chosen not to. Thanks!