MDNSResponer causing CPU to run at 100%

For a while now (ever since upgrade to 10.5) my computer seems to be always running its fan. It's very sluggish and many other problems. So, today I finally decided to start the activity monitor and take a look at things. Low and behold my processor is pegged out at 100%. The guilty parting seems to be a process named "mDNSResponder".
Anybody know what this process is and why it constantly has my computer CPU running at 100%, and what to do about it?
Thanks,
Rich

mDNSResponder is a process that searches and publishes content automatically. It's normal for it to be going non-stop in scanning IP networks. However, it should never take more than a 2-10% of your total CPU.
The MDNSResponder is just doing what's being asked of it. In short, there's an appllication/widget/etc. that's working at elevated rates. I was surprised, for example, that by signing up for Veoh, a small amount of bandwidth was being used - continually, without my knowing it - to support their whole network. The MDNSResponder helps achieve that. A network filter does the same thing. There is some service which is doing the same thing with your computer. It's magnified if you operate in Low Power Mode, since the stream of data just doesn't stop. It operates at elevated levels when an application (like iTunes) boots.
Find the application, and then decide if you're paying a fair price. You can do your own policework by playing around with Activity Monitor (which also uses it).

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