Just a few days after we introduced more complicated methods to install Honeycomb to the Nook Color's internal memory, the latest version of deeper-blue's Android 3.0 port is now available to be flashed as a zip file in ClockworkMod Recovery.

The zip, pieced together by samuelhalff, looks pretty solid so far (based on users' comments).  You can check out our complete how-to for either method of installing internally, in addition to our SD card install guide.  [xda-developers]