Greets:
Found another. :)
In the email that your bloggers get, it's links them to WP.com instead of their blog. They fixed this elsewhere in the file but not on this line.
edit wp-activate.php:
change:
<h3 class="view"><?php printf(__('<a href="%1$s">View your site</a> or <a href="%2$s">Login</a>'), $url, 'http://wordpress.com/'); ?></h3>
to:
<h3 class="view"><?php printf(__('<a href="%1$s">View your site</a> or <a href="%2$s">Login</a>'), $url, $url . 'wp-login.php'); ?></h3>
I have not confirmed this with a vhost setup so it might be different. Again, this is in v548
Hope this helps,
-drmike