yes you can still teather with the .906 update..i have never done the tbh hack..
if you dont wanna do the hack try wifi teather for root users on the market combined with most of the newer roms..i use eclipse 3.0 and together i wifi teather great and free..
Did this the day it came out. Before root was obtained for the D3.
It has survived every update so far, never had to update it. Tether still works fine. And I agree, it is WAY easier to actually do than what it looks like. However; the consequences to not reading and following instructions perfectly can be disastrous, but was well worth the effort.
After the success with the D3, a similar hack can be applied to the Xoom 4g. Was applied as a 3g Xoom, sent to Moto for the 4g update, and came back fully updated with newest version (at the time) and the hack survived the 4g upgrade and ROM update as well. Been flawless since. Flashed everything from 3.2.2 up to Jelly Bean and back. Still works.
If I had to make the changes again, I would. Thanks to TBH for all their work, and cellzealot for all his help with my endeavors to apply this to the Stingray (M602 Xoom).