In a XEN environment:

Patching a NW65SP7 server to SP8 - patch installs fine but immediate
abend (debugger) upon restart. It locks the VM and the whole XEN server
has to be restarted to clear it.

New install from the overlay DVD - Installed and restarted fine. Glad
to see they fixed the double-click problem (in SP7 a single click in the
GUI resulted in a double click, both in install and restart)

Will try installing a SP7 system and patching it to SP8 again.

Not ready to patch my production (physical server) yet...