I've had this iMac with stock 512MB for about 6/7 months now, and I'm getting a little impatent with loading times Well not just the loading times but the general sluggishness of working in OS X, such as opening the dashboard, flicking back and forth between Front Row and the desktop. I keep Azureus on most of the time while I work on my iMac, and of course that is a resource hog aswell. Anyways, I had a look on the Apple store for RAM prices... My eyes very almost fell out of their sockets when I saw the price for a 2GB stick.. 820GBP!! It's funny because at Crucial it goes for about 370GBP I need to know, will there be any noticable difference between having a total of 1.5GB RAM to 2.5GB? Is it worth the extra expense?