Because the Nook Color is designed to boot from a micro-SD Card first by default, the e-reader will run the preloaded CM7 if you select it in the boot menu.

Hackers at xda-developers have found a new hack that concerns Samsung's Exynos-based devices. This hack would allow users to boot their devices with an open source bootloader directly from the SD ...

Developers are also working on booting software directly from a microSD card. This could eventually allow you to install CyanogenMod 9 with Android 4.0 Ice Cream Sandwich on an SD card and run it ...

Now there’s a way to boot CyanogenMod 7 from a microSD card — no rooting required. That means you can pop a microSD card in your tablet, hit the power button and boot into CM7.