I got a ton of warnings when I exported my database. However it seems to have worked out fine. I uploaded the generated file to my new database and it was kosher.
I would like to know what these warnings are about anyway, just for peace of mind.
They all seem to concern the wp-includes/post.php file, and all about line 606.
Full list of warnings: http://pastebin.com/8D1bqXmX