Thanks! That was exactly the kind of feedback I was looking for. I was under the assumption that a release candidate version should be more stable than a nightly, but your point is a good one. I'm pretty happy with the stable version of CM7 that I'm running now (I think it's 7.0.2; couldn't get the market to work in 7.0.3 as I recall) so it's probably not worth risking "sleep of death" or other issues. The only reason I asked is that the update option is being pushed to my notification bar. But I'll hold off until a new stable comes out.
Incidentally, I have noticed that my nook requires more frequent charging than it used to. I too used be able go a few days between charges. Now I charge it overnight and usually have to plug it back in while using it the next evening (after maybe some sporadic use during the day and heavier use in the evening). This wouldn't typically be much of a problem, except that my wifi reception in my bedroom (which is already low) is worse for some reason when it's plugged in and will frequently drop out. It never drops out when unplugged in my bedroom. Also, when plugged in and in use, the battery barely gains any charge. I seem to remember it used to charge up slowly even when in use and this is no longer the case. I wonder if it's related to having overclocked it?