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One of the things that a default Drupal installation does is that it handles 404s for static files within Drupal itself. In other words, a 404 for a .css or .jpg file causes a full Drupal bootstrap. This is not necessary, and wastes resources on a site that gets lots of 404s: lots of code is executed, many database queries are performed, only to return a 404 for a static file.

Mistakes mean you are trying new things and being creative. No mistakes, no progress.

Open source free software and the culture around it builds in this fail fast and often, try easily, can make mistakes without hurting anyone.

The Examples for Developers Project aims to provide high-quality, well-documented API examples for a broad range of Drupal core functionality.

http://drupal.org/project/examples

http://drupalexamples.info

A Drupal 5 site (as of 2010 June).

Dive Into HTML5 seeks to elaborate on a hand-picked Selection of features from the HTML5 specification and other fine Standards.

All sorts of cool things in the new standard. There will be no new XHTML, long live XHTML-ish stuff. HTML5 is the successor.

since CCK can dynamically alter the database schema (when you add a field to a second content type or change the number of values) the query may break.

Fortunately CCK provides functions for finding a field's table and column names so it's simple to do it correctly

Karen Stevenson showed me how to do this ages ago, but i think i documented it in code instead of online, so here's the link to Drewish explaining.

Debug function used for outputting debug information.

More: http://engineeredweb.com/blog/10/6/debugging-drupal-7