Shoutbox

The idea of automatic font sharing has been discussed before - you can read about it here.

For your answering machine response,  there is a personalised status so you can use preset automessages if you use them a great deal. This may not really solve your problem, but as they are preset you can easily change them in the preferences.
OR - You could always use cut & paste to copy your original message - that saves you retyping the whole thing