MBP Frozen after Display put to Sleep
A very similar issue is/was happening to me. I got a brand new 15" i7 with hi-res screen. Soon after buying it and installing vmware fusion and dropbox, it started giving me problems. Whenever I put the display to sleep for long periods of time, 1h+, it would refuse to wake. The whole computer became unresponsive. I even took it to the Apple Store, and they did not know what to do with it.
I have since had it replaced and all was good for a few days. But, lo and behold... the problem is back. I put the display to sleep and it's a crap shoot as to whether the computer will actually come back on. I have done all the usual resets (PRAM, etc.) to no avail. I even uninstalled vmware fusion and no luck.
Upon closer look, it seems that the issue arises when Spotlight is trying to index my HD volume. I remember the same thing occurring with the first MBP. I guess I could disable Spotlight, but should I have to? This really bites and is totally frustrating. I wish I knew what to do.