Upon upgrading to WordPress 3.0, you might notice the Meta Page Title joined without spacing between the blog title and blog name.
This problem arises when using the Twenty Ten theme or a theme designed using the Twenty Ten theme in conjunction with the All in One SEO Pack plugin. If you have set the configuration to not display the Blog Title as follows, the title function causes the above problem.
Open the functions.php from the Twenty Ten (or your modified) theme directory. Go to line 262 (approx) and comment out the following line of code.
add_filter( ‘wp_title’, ‘twentyten_filter_wp_title’, 10, 2 );
WordPress 3.0 is awesome!