I use Barnacle to tether my Nook Color. For Nook users, realize that the OD will only support Ad-Hoc networks. The Nook color (IKD about the tablet) will not support Ad-Hoc networks without rooting and a bit of code. Or you could do what I did, and load CM7 on the nook, then everything works.
The only issue I have with Barnacle, is sometimes the wi-fi manager does not exit properly when barnacle starts and the network never stabilizes. (Nook will see the network, but the net fails before nook can get an IP) (I think the cause is barnacle not shutting down properly b/c it happens most often when I shut down Barnacle and then restart it) My work around for that is to exit Barnacle, go to the wi-fi manager, and manual cycle it on/off/on, then re-try Barnacle. sometimes this fixes it, some times I need to re-boot the phone.