It states that updating of the $id$ tag isn't automatic with SVN, as it must be with CVS and that I need to turn it on.
AHAH. I figured it out. I have to go in and set the svn:keywords property to every file in the repository (ooooh, fun), and then it doesn't modify it on commit, only on update. 4 commits later on one file to figure that out haha, hope nobody looks at the revision history of that one.