Well, first post on the forum, but I have to chime in with my bum battery Nook touch as well. I just got it as a present for Christmas (actually Christmas eve). On the first full charge it lasted about a week, wierdly.
It wasn't noticably discharging in sleep mode, at least if it was, only a little. I had it down around 78% reading probably 2-3hrs a day and lots of tinkering (creating shelves, playing around in settings, shooting through page turns, doing dictionary lookups), probably hammering a lot more than normal. Then Friday night I plugged it in to my computer to load up a few more books (I had it plugged in maybe 15-20 minutes initially after the first full charge to side load some content on to the SD card).
Well, it gave me a 0% battery warning. I don't know what the charge level was earlier in the day, but the night before I was down around 78% before going to bed after 6 days of moderate reading and lots of playing around. It refused to power on until I charged it, but it charged to 100% in about an hour total from the charger...which seemed way too short for a full charge with BN saying 3-3 1/2hrs for a full charge.
Over the long weekend I used it heavily, mostly reading, and it burnt through a claimed 100% charge in 3 days (dead, or effectively so last night). With that 100% charge Friday night, it was also around 88% Saturday morning, around 68% Saturday night, 54% Sunday morning, 38% Sunday night, 26% Monday morning and 8% when I plugged it in to my computer last night to rearrange my ebook collection. As soon as I plugged it in, the screen flashed 0% charge again. This time around though it took about 2 full hours to reach max charge, though it remained plugged in most of the night to the charger as it was at 91% when I checked after 2hrs and went to sleep at that point (I figure it sipped about 6-8 minutes of charge plugged in to my computer on top of the 2hrs of charging and if it was really at 8% rather than 0%, that is a lot closer to 3hrs of charging than the 1hr previously). It was on a timer for the charger, so it really powered "off" the charging at around 3-4am and around 5:15am it was at 99% when I powered it off per the BN forums suggestion in the battery issues thread.
After just checking (as I write this) it is at 96% charge. I spent about 15 minutes on my lunch hour re-doing all of my shelves (11 of them and about 150 books on the various shelves, so lots and lots of screen changes/refreshes). It has only been on/sleeping since around 11am, so about 5 1/2hrs now. It was at 96% IIRC when I put it to sleep after setting up all of the shelves (it claimed 98% when it booted up) and it was deffinitely at 96% when I checked around 2:30. I don't feel like it is enough time to really get a feel for if the battery life issue is continuing; however, the performance over the weekend saw something like a 2% per hour battery discharge when not in use (about 3-4% per hour when in use reading). So far at most I've seen 2% battery discharge in 15 minutes of intensive use and 5 1/4hrs of standby if we go with the 98% baseline.
Fingers crossed that the worst I have to do is reboot it after charging fully to give me acceptable battery life. I don't need the claimed, all I need is basically 2 weeks of reading 1hr a day as a minimum. What would make me happy would be those 2 weeks at 2hrs a day.
A question, those with the battery life issues, are you using a micro SD card, either in the nook and/or with content stored on it? I do have one (and have since about 5 minutes after unboxing), but I am curious as to whether there is some issue with the micro SD card causing bad battery life.