lucy24 - 8:38 pm on Nov 2, 2012 (gmt 0)

I disagree about wp making those urls...figuratively it does with the rewrite and without a redirect.

You can't make an url figuratively. It is either there or it isn't. What WP is doing is SERVING CONTENT from one location while pretending to live at a different location.

@deeper: The bottom line is this. Even if the only change you make is in removing the final ".html", you have still changed the URL. That means people requesting blahblah.html (from outdated bookmarks or similar) must be redirected to the naked "blahblah" form. You can't have both forms floating around unless you truly aren't concerned with Duplicate Content.