I see this sort of nonsense posted so much here. If the machine is good enough for you, and you'd likely want to hold on to it for a few years, should Apple sit still until 2012? It might be fast enough for you, but you have to be less solipsistic and look at the industry at large.
It is similar to the iPhone posts: just because many are happy with the camera, not looking at the wider picture they miss the iPhone looks quite puney in spec to the competition. (We continue to have EDGE defenders too.) And this is harming the sales.
Apple has a plan for Grand Central, Snow Leopard and processor upgrades and the iMac is well behind the schedule. This has shown in sales where the upgraded notebooks flew out the depots but many are waiting for rightly expected iMac upgrades.
Yes the current iMacs are fast, but the processors are now well behind the curve and the longer term architecture for Snow Leopard and should have been revised November 2008.
I know this might upset the reality-refusing-fanboys.
Yours in asbestos clothing!