Matt you mentioned using the keyword sub and update the revision comments.

From what I read SVN simply searches the document looking for a text string such as $Rev$ and then replaces it with a value such as $Rev: 12 $: This indicates that the revision of the package when committed was 12.

Do you simply put the value "$Rev$" into the version comments field. Then on commit will it update the working copy with the committed revision number?

thanks