So, on MacRumors and the Apple forums, there are documented issues with Macs that won't wake from sleep. The aforementioned links show forum posts of the issue, but in all honesty, this has been going on for quite awhile in the Mac world: here's an example of ALL Mac machines and not just iMacs.
I've experienced this only once with my new iMac. It happened on the evening of the 17th of March. It hasn't happened since. I know the machine woke because I heard it turn on inside the case. I think the screen/monitor couldn't recover for some reason, and I ended up rebooting.
Some are suggesting that this is a hardware issue with the iMac. I doubt it, since it's been affecting other machines (for years). It almost has to be third-party software being installed, or maybe some recent patch that's been affecting the recent iMacs, but really, again, this has been going on for years. There's one report that people with G5s have always experienced this issue. I have personal experience that it was happening with Macbooks, although it hasn't happened recently.
What really hinders the troubleshooting of this is the fact that its happening intermittently. Some people are reporting that they've fixed this by reinstalling OS X. Others are reporting fixes by resetting the SMC. Some are removing widgets and software and seeing results. Some are reporting fixes by unplugging USB hubs from their machines. Some are getting internals replaced by Apple, such as graphics cards, power supplies, and motherboards.
Honestly, this is all over the place and could hint at multiple issues.
There's been no official word from Apple (ever).
[ EDIT 4/2/2010:
http://support.apple.com/kb/DL1018 addresses the waking issue. ]
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