Your "blue screen crash" when exiting from sleep mode sounds very familiar.
It happens here on one machine where I have RC1 Build 5728 x64 installed.
I have an "unknown device" in Device Manager which appears to be the ACPI
driver (I had to do a clean install because I was going from 32 to 64-bit so
all my previous drivers were lost). I'm reasonably sure the lack of that
driver is what's causing sleep mode to destroy my computer (and it really
does destroy it -- most of the time after the error occurred, my file system
was trashed and I either had to re-install from scratch or restore an image
backup).
So, I've just turned off sleep until MS or the motherboard manufacturer come
up with a Vista compatible driver.
It would be nice to get sleep going on this computer again. On my other
computer where it is working, I'm quite impressed with how Vista has
improved sleep mode.