I'm running Firebird 0.7, and when I upgraded to WP 1.0, I noticed a pretty ugly glitch in how the admin pages look:
wp-post.php in Firebird
I think it speaks for itself - the positioning is all screwed up. I haven't touched the CSS for the admin backend. It's looking normal over in IE6.
If I use the "advanced editing" option, it renders in a more useable form (stuff's not overlapping), but it's still signifcantly different from IE6 (and the logo in the upper left is still messed up).
Anybody else seeing the same, or am I just unlucky?