This would be cool, not having to configure every app to properly use Tor without leaking dns and such. However, I personally put Tor in the "cool" catagory but not necessarily "useful" (to me anyway). But, if someone wants to post a bounty for it, I'll pitch in. It would be a weight off one's mind, being able to offer wifi without worrying about what unscrupulous activities that wardriver or neighbor may be getting into from your IP.
-pc