If you are 1.4.3 you are definitely rootable.
The only know method right now is the one with the fake update that modify the wifi start/stop script to make it start the ADB Daemon.
You basically have to make your Nook try to update from Nomad's website, where the fake update is hosted.
To point your Nook to Nomad's place, you have to create your own DNS server, with Nomad's ip address. A way to do that is using Tftp32D or Treewalk DNS.
To make the Nook actually listen to what Tftp32D/Treewalk DNS is telling, you have to tell either you router that your computer is the DNS server of choice, or turn your computer into a router, using a wireless card and Connectify Me on Windows 7.
I personally use my router and a linux server with BIND9, much easier :P
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