Updating to 7.0

The first system i updated to 7.0-PRERELEASE after the branching was my via my pf/squid system. The update went painless, although i first screwed up mergemaster and merged from the RELENG_6 directory instead of the RELENG_7. My desktop was updated to 8.0-CURRENT too.
After these two went well i decided to upgrade my home server. Unfortunately this one did not went as well, i am now running into the “panic: ffs_blkfree: freeing free block” panics few times a day. Yes, i should have read the CURRENT-mailbox before updating, there have been a lot of sightings of this panic in the last days..
But i am currently permanently short on time, so i am not following the mailinglists that careful 🙁
Note to self:

xorg 7.3 woes

While the switch to xorg 7.2 has been quite painless. The update to 7.3 was a big problem on both of my desktops.
My Desktop at home has a display with an incorrect EDID, and in xorg 7.3 it is broken to override these values. Hopefully this is fixed in the next version.
My Desktop at work has several problems. Problem 1: xf86-video-mga 1.9.100 is broken with my Matrox Millenium 2064W. I had to downgrade to, otherwise the Xserver would abort with a signal. I have no idea how to debug this further, as a Backtrace does not seem to give more hints.
Problem 2: If i move the mouse to the right screen (Screen0) I can’t move it back to Screen1. There was one thread on the mailinglist, but no general solution. Any ideas?