acpi causing problem with eth0
This problem appears to be a change in acpi for new kernel. I saw this problem on FC3 126.96.36.1991_FC3 with "irq 9: Please try booting with acpi=off and report a bug" in /var/log/messges. Kernel 188.8.131.527 works fine.
To turn acpi off at boot, wait for grub menu to appear, press letter "a" key then add
to end of command line, then enter to boot.
If this does cure your problem, then to turn off every boot, edit /boot/grub/menu.lst and add acpi=off to end of kernel line
kernel /vmlinuz-2.6.9-1.681_FC3 ro root=LABEL=/ acpi=off