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I don't think so.. I purchased some RAM yesterday from macsales.com I believe you'll need the - PC5300 DDR2 667MHz 200 Pin.

Prices vary, but I picked up 4GB for $159
 
You need notebook memory! Here is a thread from yesterday when there was a fire sale on Crucial 2GB at buy.com. Dig down to near the bottom of page two and you will find a link to the MR guide to Intel Mac Ram

Mushkin had some 4GB on sale for $81 per. They didn't have any in stock and haven't responded when it would be available. Go to the forums and search on iMac and you will see a thread about compatibility with iMac

aviddk
 
If you are looking for some inexpensive ram you can check the thread in my signature. :) Good luck on your hunt!
 
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