I upgraded quack to FreeBSD 8.0 RC3 this evening. I also re-enabled the journaling on /home. The last time I tried the journaling for UFS, it was very unstable. Hopefully in the interim, things have gotten better. If I don't post bad news, then you'll all know it went well.
The only other minor upgrade gotcha was that the APC daemon that monitors the UPS failed. All I had to do was change the device name and rebuild the port and it worked once again.