What needs to be on the boot drive?

My dual 2 GHz G5 has two Maxtor 160 GB internal drives (model 6B160M0 to be exact).
As my boot drive gets fuller (it's now 60% full), everything appears to slow down.
I'm thinking about paring down what's on the boot drive, and moving everything else to the second drive (right now, it just holds MP3s).
What MUST be on the boot drive, and what can safely be moved to the other drive?
Thanks...

Page in/outs were 109776/2131; at this point CPU
usage is 95% idle; disk activity shows reads in as
1339238 and writes out as 86684.
It's the pagouts per second that's important. A few
per second is fine, 100 per second is far too much.
I changed the update frequency to 1 second. The page outs, no matter what I did, remained 0.
For disk activity, look at Mbytes per second, read
and write. If it's staying around 20 Mbytes per
second, you are being limited by the drive. If that
is the case, you should add a drive and arrange your
tasks so that both are used at once. If you can't do
that, you could use RAID, but that is a lot more
complicated.
The Mbytes/second, read and write, never came close to 20 Mbytes.
Thanks...

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