I just installed kernel-2.6.10-1.1056_FC4 and the related newer packages from rawhide to try and reduce or eliminate kernel panic and not shutting down the system past the acpi_power_off portions. Both issues are resolved for an hp ze4315us computer anyway.
I would not post devel topics here if it was not to help those resolve current FC3 shortcomings.
Hapy New Year!
Jim