Use CWR to install the attached zip.
Note that this zip is different than some of the other ones floating around on the forum. This only *only* replaces uRecRam, the recovery ramdisk, with the stock 1.1 uRecRam and thereby uninstalls CWR. From my understanding, the other zips completely restore everything in /boot.
After installing this zip, reboot. You will probably get an "Installation Failed" screen; just reboot after that and you'll be fine.
It appears that something in 1.1 is not clearing the trigger to boot into recovery. This happens ever time CWR is run, so if you re-install from ROM Manager to make a backup, you'll have to re-apply this zip.
Remember to have your pet Nook nootered!