Drupal developer search engine

One of the things about doing Drupal development is one is always searching for information. There are many great sources of information and things like Planet Drupal that are a wealth of information. Then there are sites like the API site and sites for PHP and MySQL manuals that come in handy for other things. To make it easier to search the areas I needed I setup a Google Custom Search Engine for Drupal developer search. Please feel free to add additional sites that would be useful. Presently in addition to the main drupal.org sites it searches Planet Drupal, PHP, MySQL, and w3's CSS documentation.