Somebody just pointed out to me an application called JoikuSpot for your cell. This should enable you to tether over wifi. Maybe you can give that a try? (And report back if it works )
I was able to access the app wifi tether with my DInc and it works. It's just my zt-180 won't recognize it. Also a friend with a different rooted htc tried with his phone and it wouldn't notice his either, but it noticed the legit moto droid. Could there be something that I'm missing like a setting or something?