The Nook Color can be easily made to run CyanogenMod 10. If such a Nook Color is connected to the same home (wireless) network as your computer, then it is pretty easy to SSH to it wirelessly.
Make sure your Nook Color running CM 10 is powered on and connected to the home network.
Note down the IP address assigned to your Nook Color. Since the IP address given by DHCP varies, it is convenient to assign a static IP address to your Nook Color.
Install a SSH server on the Nook Color. I installed DropBear Server II from the Google Play Store.
Start the DropBear Server II app. Choose Install. You will be asked to provide it superuser privileges.
Start the SSH server by choosing Start in DropBear Server II.
The password for root user can be found in the Settings section of DropBear Server II. Change it to anything you want.
On your computer, ping the IP address of the Nook Color to make sure it is reachable over wireless. If you cannot ping it, you have some networking problem.
If you can ping your Nook Color and its SSH server is running, then SSH to it using PuTTY. Provide the IP address of Nook Color and use root as user and password set in DropBear Server II as the password.
Happy hacking! 😊
Tried with: Nook Color 8 GB, CyanogenMod 10-20121228-NIGHTLY-encore and DropBear Server II 1.5.4