Dadnab is an Austin Texas based company with an interesting SMS application:

Dadnab  is a text messaging service that plans your trips on city transit.  Without web access and don't want to study the schedules?  Dadnab tells you which bus or train to take, at which location, at what time.

They recently added the Bay Area to their system:

A Bay Area Dadnab user sends a text message (SMS) with an origin and destination to [email protected]. Seconds later, the user receives a text message with the optimal routes and times to get to the desired destination by rail, bus, or ferry.

Dadnab incorporates schedule information from 28 Bay Area transit providers and serves a population of more than seven million residents in the region.

This is an interesting use of text messaging--the only question is, how well would this service work for complicated directions? Would such a response overwhelm the user? Would it require multiple texts? Regardless, this is an innovative service, and if they could figure out a way to account for service delays and shutdowns--which would have been a godsend during New York City's recent subway flood--they might have a killer app on their hands.

Read the entire press release here.