The latest updates to UDev require a kernel higher than what we have avail here. You'll most likely want to IgnorePKG udev, until vpslink bumps us to atleast 2.6.24. You might also have to mess with the packages initscripts, filesystem, and syslog-ng some. All of these packages are recomended by the Arch devs to be upgraded together, due to /dev filesystem changes associated with the UDev upgrade.
See these news articles for more info.
Arch Linux - News - /dev layout cleanup
Arch Linux - News - Udev Minimum Kernel Version