CPU Usage Seems Very High

Seems my CPU usage is very high.
Right now I've shut down any other users and am only running firefox, activity monitor and some dashboard widgets (that the activity monitor shows are not using any resources) yet my CPU usage is bouncing around with user at about 70%, system at about 15% and Nice about 10%
On the activity monitor something call perl seems to be using all the CPU.
What's going on and what can / should I do?
Thanks
iMac G5 20 Mac OS X (10.4.8)

I'm not making much progress.
This morning after startup and with both my wife and me logged in the HP Scanjet manager process seemed to be taking over -- I quit the process and the CPU use calmed down.
Then I rebooted and with only me as the user and only the activity monitor launched the "perl" application consumed around 90% of the CPU.
I unplugged all extra USB stuff (including the scanner) and rebooted and the same is happening -- perl is at about 80% but it seems to split responsiblity between the user and the system (40% user / 60% system with perl at 80%)
The only other thing I have plugged in is an external hard drive connected by firewire -- it takes a back up every morning and houses my iTunes library.
Any thoughts?
iMac G5 20 Mac OS X (10.4.8)

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[rant]
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[/rant]
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