Weird.. I had to replace the jsmin.php now with the newest one from googlecode – finally the minifying works ;) gzipping is still not working but I’m using the ob_gzhandler in the htaccess-file now. Works like a charme ;) In WordPress 2.8 the plugin PHP Speedy seems to become useless anyhow.. the features should be implemented but I had a lot of problems with the latest bleeding-version. Thanks for your help.

Only thing missing: update of your great tabbed widgets-plugin to make all widgets list (like Ajax Calendar) ;) Thanks!