Lately Jeff has been talking about ESS.
Here is a way that it could help us. We could use it as a means to let our clients know where we are and how we can be reached. We could have an ESS feed that would contain our appointments and future trips. We could then build an aggregater into our applications and our clients could click a link that would say "Where's Tim" or "Where's Kyle" and it would let them know and what number to call to contact us.
I posted earlier that some our clients don't always call the right number and this would help that too.