I am not entirely familar with OSX (Windows is my home boy), but how were you connecting over Wifi with your original nook? Was the macbook actually setup with an ad hoc wireless connection with a bridge to the USB modem?
From a touch of reading up, in OSX you have to manually setup an ad hoc wireless nework and specifically setup a bridge, but it sounds pretty easy to do (a google search on "OSX wifi ad hoc network" should turn up what you need). Is the Nook ST not showing the network at all? Or just not connecting? Especially in the later case, it could be how OSX and/or Bonjour is attempting to do DHCP that is incompatible with the Nook ST.
I'd check the settings on the macbook to see how your ad hoc network is setup and play with them to see if you can get the nook ST to see the network and connect to it.
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