Changing the permalinks is still not happening.
Headers sent is because of an SQL error: Unknown column ‘post_name’ in ‘field list’
Hmm, maybe I should wait till these things are fixed in a next release…
For those who, like me, want to avoid JavaScript, I have some simple PHP scripts that work at http://www.stijlstek.nl/archief/2003/10/29/php_styleswitcher.php – the scripts are clear enough I think, but if you need translation (the article is in Dutch) I can provide it.