Just wanted to update on my fridge magnet.
It's been almost 2 years since I mounted the Nook Color to my fridge. It's now running CM10. It's screen is on 24/7. I use the waving grass/current weather plugin to prevent burn-in. Only the Pandora widget has a very, VERY slight amount of burn-in. I'm thinking of a different live wallpaper to prevent further damage. We use it regularly to watch Slingbox, play Pandora, occasional NetFlix, and ALWAYS to keep up with our multiple Google Calendars. It is also a nice way to quickly check the Gmail when I can't find my Nexus 7 or Droid 4 (or I'm too lazy to walk upstairs to the computer).
The battery is still holding a decent charge.