New install using GUI installer (used fdisk to write empty partition tables
to disks before starting install)

Using fdisk, I created partition tables on two drives, including a swap
partition which I made type 0x82.

anaconda then brought up disk druid to label the partitions, where the swap
partition was correctly recognized as swap.  I mkfs'ed and set mount points
for all the 0x83 partitions, and did nothing with the swap partition.

When I hit next, a warning popped up about no swap being available.  I was
only able to get it to recognize the correctly created swap partition by
hitting back and changing the type of swap to ext3 and then back to swap.

After doing that (which I shouldn't have had to do -- it's highly
non-intuitive), the installer died with "a serious error initializing swap".

I was finally only able to get install to proceed by starting over from
scratch, creating swap in fdisk, telling anaconda to proceed without swap,
and manually running mkswap, swapon, and adding an entry for swap to
/etc/fstab after the install finished.

The swap partition I created was 512 megs, which certainly isn't
unreasonable.  I have no idea why anaconda choked on it.