So, they upgraded to wordpress 2.1 tonight. So far, things seem to be going well.
They had some issues with the widget page and the links list (now called blogroll), but overall things went smoothly.
To solve the widget page issue, they had to hard-code /wp-includes/js/sciptaculous/ into the newest version of widgets.php, but everything else went smoothly.
Oh, and the spell-checking built into the visual editor rocks!