I've noticed a problem in the WP 1.5 Control Panel for editing already-created pages. The Tabbed interface does not reflect what's going on in the main editing area below.
How to see the problem:
When on an existing Page, click the Edit This link.
WP changes to Control Panel view.
But!!! the WP control panel does not go to Write > Pages, but to Write > Posts. The h2 title of the editing area *does* say Write Page, and the contents are for pages, but the tabbed UI at the top does not. Very confusing, that.
I'm using Pages to make a site w/ many "static" pages. (The time-based webloggy stuff to come during phase 2 of the site.) Later today, I'm going to go over with client how to begin adding content to the site on various pages, and after carefully telling her about "now that I upgraded the site, we'll be using pages" I will explain to her "this little bit of the software is broken."