If you have noticed all your blog images breaking after upgrading to WordPress 3.0 from WordPress MU, you will need to make a simple change to the .htaccess file.

1. Remove the wp-content/blogs.php file as it is no longer supported in WordPress 3.0. It has been replaced with wp-includes/ms-files.php
2. Locate the .htaccess file in the root directory
3. Find the following line:

   RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]

4. Replace it with:

   RewriteRule ^(.*/)?files/(.*) wp-includes/ms-files.php?file=$2 [L]

5. This should fix the problem with broken images/files not showing up in the WordPress MU blogs.