This isn't quite kosher for Ultra-Orthodox Rabbis yet, but perhaps that will change in time:
Have a question about halakha - why not SMS the rabbi?
"The Rabbi Shlomo Aviner, writes and receives an average of no less than 3,000 cellphone text (SMS) messages a month. Almost all are questions of halakha (Jewish law), to which Aviner responds in short, "permitted" or "forbidden", without giving the reason."