Sorry I can't help but I've been searching myself for months. And this almost got my hopes up..
What I want to do is turn my device into a portable web server.
But here's what I envisioned. You are at a large convention. There is no Cellphone tower signal and the location doesn't provide wifi. You want people to get a PDF file on the spot. Blackberry, iOS, Android whatever can access the wifi. So you make a small portable device that can serve up webpages. I could do this all on a laptop. But 6 ounce device that can do all that would be much better.
So just putting it out there for some developer reading this going man why would someone want a captive portal on android.