[CentOS] kernel panic this morning

When I came into work this morning the console had the following:

bio_endio
__end_that_request_first
scsi_end_request
scsi_io_completion
scsi_finish_command
scsi_softirq
__do_softirq
do_softirg
do_irq
command_interrupt
default_idle
cpu_idle
start_kernel

Panic

I am running software RAID-1 on this machine. I had 2 IDE disks and the
machine when down once in a while with similiar messages. I switched to
brand new 300 GIG SATA drives and now I am seeing the same kernel panic.

What might be the problem here?

THanks for any suggestions.

Machine has 2 GIG RAM, Intel motherboard, Intel CPU 2.4 P4, "/" is 50 GIG,
I have a 5 GIG Swap, and the rest is "/home". where / and /home are 
RAID-1 arrays.

Jerry