Not exactly a beta, but I tried the 2004-08-10 nightly just now. And stumbled over something I allways notice with software that want's to serve HTML pages with UTF-8 charset. The pages include a meta tag telling about the charset - but the server still sends out the default charset in the HTTP headers in requests. Many browsers regard - correctly - the HTTP header higher than the meta tag. It would be a very good idea to add header(...) calls to the wp-blog-header and admin-header in WordPress so that all pages are served with the correct HTTP header. Sure, people could change that in the Apache configuration, but usually this isn't done. Setting it explicitely in the pages is much better - and you actually try to do that already with the meta tags.