[svn] SVN: Is there a way to mark a file as "do not commit"?

Check out changelists, which can provide you with an option to filter out files you have changed but do not want to commit. SVN will not automatically skip a file unless you tell it to - and the way you tell it that this file is somehow different to other files is to put it in a changelist.

It does require more work for you, and you can only apply the changelist to your working copy (obviously, imagine the chaos that could ensue if you could apply a 'never update' property to a revision!).