‘post_name’ field?

Hi all,
Downloaded the latest from CVS today/now (monday 3 nov, 12:25am GMT+13), and when I try and post I get the following error:
SQL/DB Error —
[Unknown column ‘post_name’ in ‘field list’]
This is mentioned in wp-post.php (on line 87, as part of $postquery, it’s the last fieldname), but doesn’t seem to exist in the database tables it created.
Maybe a bug? Maybe I just CVS’d at the wrong time (having never used CVS before in my life).