The pri on that swap between sda2 and sdb1 is a pretty spiffy feature- it in effects makes a RAID 0 swap partition that is much faster than a swap partition on a disk alone. If one of the disks borks, then the sdb2 swap will be able to be mounted from the rescue/install CD. I have 6GB swap as it is a 64-bit box and I do things like run a few VMware terminal sessions and that can tax the 2GB RAM I have in my system.
Both of my machines are dedicated Linux machines since about a few months ago when the then-latest Windows Update hosed NTLRDR, rendering Windows unbootable on my laptop. The desktop never had and won't ever have Windows on it- I just haven't needed it. So that 8GB space on hda1 is pretty much useless and probably will get dumped soon. I never used Windows anyway, so I guess I'll just get my 8GB back.