Few weeks ago, Cathy mentioned in her monthly Exchange Server Documentation Update that Exchange 2003 documentation can now be annotated by people like you. Then David mentioned that too on his blog reminding me that I really wanted to call this out too.
Essentially - what has happened is that our UE team has worked with TechNet folks to give you the ability to comment all of Exchange 2003 docs that are online. The UE team will take a look at comments given and tweak the docs if necessary. All comments will make it to the UE team, so this is a great way to provide feedback, request clarifications be made in documentation or report bugs.
We still have the "old" way of document rating and providing feedback too: