I don't think you can do this in the states but here in Japan, now, when you
get something delivered to you (think UPS/FedEx) you can have them e−mail
your cell phone. Unlike the states, cell phone e−mail is very popular
here. Of course it helps that the phones have larger displays and better input
systems.
Anyway, why would you want them to do that? Because, they will tell you,
within a 2 hours time frame, what time they are going to deliver the package
and if you are not going to be there you can go to their webpage from your cell
phone and tell them when you will be their and they will re−schedule the
delivery. Pretty cool!