Hello,
yesterday I upgraded to udev-96 and could no longer boot into my Slackware system. The Problem was, that udev did not create the /dev/* entries for the harddisks (and probably many other things as well), because it lacked /sbin/udevstart and /etc/udev/scripts/make_extra_nodes.sh.
As I was unable to boot my Slackware system I used a Knoppix CD to boot the computer, downloaded the package udev-71, extracted it and put those two files there manually.
After I could boot my beloved Slackware again, I uninstalled udev-96 and reinstalled udev-71.
I cannot say what the problem exactly is, but this at least gave me a working Slackware back :-)
Now I cannot wait for 11 to come out - I promised myself to do a clean reinstall when it get released