Reports of beta testing for 8.04 LTS seem very positive all round, to the great credit of the desktop and server teams who have been working so hard to make Hardy Heron rock. I have been running Hardy on my laptop through most of the cycle, but took the plunge on my home firewall and desktop (Kubuntu) machine this weekend.
The coolest part of the firewall upgrade is the fact that Michael has made the release upgrade tool independent of the GUI, so you can use it for server upgrades too.
So, now would be a great time to test the upgrade! File bugs if you run into any issues with your particular configuration. Apparently, this is upported on both Ubuntu 6.06 LTS (Dapper) and Ubuntu 7.10 (Gutsy), so feedback on either upgrade path would be most welcome.