One of the tools that really helps me in busy seasons like this one is the ability to respond to emails via voice. Using Jott for Blackberry, I can talk into my blackberry (with a free Jott account) and Jott sends my spoken words as an email to the party intended.
Much better while driving than trying to type on very tiny, accident inducing buttons!
I see that the Jott for Blackberry site is temporarily closed due to a high response, but it is supposed to open up again soon. When it does, check it out!