dbtng

http://api.drupal.org/api/drupal/includes!database!database.inc/function/db_select/7
http://tiger-fish.com/blog/drupal-7-debugging-sql-queries
http://www.lullabot.com/articles/simplify-your-code-with-drupal-7s-database-api
http://data.agaric.com/keywords/dbtng
http://blog.worldempire.ch/de/story/howto-convert-module-dbtng