These are good HTML validation tools to ensure your HTML is clean... clean HTML means better SEO (search engine optimization) and typically faster page loads.
I will be proposing some sessions/talks for DrupalCon SF in April, 2010, and want to find out what Drupal users/developers want to learn about. It can be at the beginner, intermediate or advanced level. What Drupal tutorial would you like to see?
I presented a talk on building Drupal image galleries using the Dynamic Display Block (DDBlock) module at the Stanford Design4Drupal camp (http://d4dstanford.prod.acquia-sites.com/schedule). I'm attaching my how-to doc and presentation docs here as well as a zip of the database and entire code tree.
Here's a grid of top ten Drupal modules recommended by the top websites (per Google - 2009 posts only) as of December 2009. The websites are numbered 1 to 10 and if the particular module was listed in that site's top 10 Drupal modules list, then it has an X in the column for that site. So far, I have gone through 6 websites.
I get a lot of calls and emails for Drupal work. Often many more than I can handle. It's common for these companies to complain about how hard it is to find a "Drupal expert". So what can these companies do to find the right Drupal programmer for their project?
Are you wondering how to make Drupal SEO friendly? You can start by taking a look at the list of Drupal SEO modules that are available for free.
If I was only allowed to install my top 10 drupal modules (besides core and SEO-related modules), here's what they'd be. Also, check out the list of Drupal SEO modules.