What can I do about my 20 inch iMac (Core Duo) doing a LOT of disk activity?

What can I do about my 20 inch iMac (Core Duo) doing a LOT of disk activity?
I have iStat and can see the disk activity which halks other operations till it finishes.
Is there some built-in Optimization software I should use?
Thanks,
Tom

Please carefully read Pondini's Time Machine Troubleshooting guide.

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