At the bottom of the html document produced by Mathematica is a link to Wolfram's site.
It says: Created by Wolfram Mathematica 8.0
I think it would be nifty to have the option to precede that link with a custom link.
For example: Copyright 2012, Fred Daniel Kline - firstname.lastname@example.org
Note: I prefer my email as an image to prevent netbots from grabbing it.
Perhaps we could have a special cell that, if present in the notebook, would be displayed automatically. Edited: Also would like this option for pdf's.