How can I identify the cause of high CPU usage

Just recently, my Mac Book Pro CPU usage has gone through the roof, and the temperature quickly rises to around 80ºC, with the fans are working pretty hard to keep it there.
I've looked in Activity Monitor, but there's nothing unusual as far as I can tell in the list of processes, but it does show that the system is continually using between 30% and 40% of the CPU all the time, even if I have no applications running. From a cold start, it starts using that much CPU as soon as OSX loads.
Here's a screen grab of the activity monitor window
One thing I thought was strange is the amount of Virtual Memory that Growl uses (37gb) but according to the growl website, that's not unusual. I've also tried quitting Growl, but it makes no difference.
I have 30GB of free space left on my HD.
Any ideas? I'm worried my Mac Book might be on it's last legs, so I'm hoping and praying that this is something simple-ish.
thanks
-t

Your fellow MacBook Pro users would be found here:
http://discussions.apple.com/category.jspa?categoryID=190
http://www.apple.com/support/macbookpro/
Might also want to check out the Mac OS X Snow Leopard discussions.

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       532 rdbms ipc message                                                WAITING
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       538 rdbms ipc message                                                WAITING
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       544 rdbms ipc message                                                WAITING
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       548 gcs remote message                                               WAITING
       549 gcs remote message                                               WAITING
       550 gcs remote message                                               WAITING
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I think xml schema is created already...and its progressing as you stated above. Please correct if i am wrong.
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And i am really sorry if i am irritating you by asking all stupid questions related to xml.
-Yasser
Edited by: YasserRACDBA on Nov 17, 2009 3:39 PM
Did syntax allignment.

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