http://www.copyright.gov/register/literary.html

“Many works transmitted online are revised or updated frequently. For individual works, however, there is no blanket registration available to cover revisions published on multiple dates. A revised version for each daily revision may be registered separately, provided the revisions constitute copyrightable authorship. A separate application filing fee would be required for each separately published update.”

And then from the Circular they refer you to (http://www.copyright.gov/circs/circ66.html):

“For all online works other than computer programs and databases, the registration will extend only to the copyrightable content of the work as received in the Copyright Office and identified as the subject of the claim. The application for registration should exclude any material that has been previously registered or published or that is in the public domain. For published works, the registration should be limited to the content of the work asserted to be published on the date given on the application.”

And then, if that really is worded poorly, how does the Copyright Office expect someone like me supposed to know that?

2. Registration post-infringement allows the author to sue, but does not allow recovery of certain remedies like attorney’s fees and statutory damages.

3. Got a link for that reference to the Copyright Office information that you’re citing? It may not be worded correctly - for example, most novels are created and revised over a span of several weeks, months, or years. Based on what you’re saying, each daily revisions would require separate registration and I’m fairly confident that’s not the case.