Open Calais is a really interesting project.  We're using it currently to tag articles automatically on a site we're developing called RootsWire.  RootsWire is a blog aggregation project, and one of the first things we're using it for is to build a joint coverage system for the Democratic Convention.  Calais has been really helpful for this.

Howto use CiviCRM Custom Searches.

Mystified by Contexts in Panels 2? This might help

Nice brief article on creating templates for content creation in TinyMCE.

New plugin for views 2 to allow ordering of content by AJAX drag and drop.

Nice brief run-through (not much detail though) on using invite with multi-step registrations.

Zivtech explains the Drupal Node Access functions, along with some good pointers on how to use them effectively.

Nick Lewis reviews (briefly) five WYSIWYG editors for Drupal 6.

A great little article on building data objects in Drupal from your client's spreadsheets.

A list of some of the more successful site recipes for building different kinds of Drupal sites.

Brief tutorial on using Drupal Installation Profiles.

Quick Tutorial on writing a block that rotates images on a site.

Using Imagefield and Imagecache together in Drupal 5.

A great small article on configuring and using Drupal Search effectively

Nice screencast on building local video applications in minutes.

VIdeo tutorial on the Asset Module and Media Mover, and using them together.

This is a little more advanced than most of the resources we highlight here, but it's a useful article about doing migrations to drupal from other forms of content.  Nice article from Acquia.

This is a great idea - a scaffolding module for Drupal.  It's basically a core module-building template that lets you start out with tried and tested examples of how to build a module, and then lets you fill in your own customized code - Another great idea from the Lullabots!

The Lullabots explain it in Drupal 5 and 6.

A screencast on doing mashups of videos from Blip.tv using emfield and aggregation.

Nice tip from 11Heavens

Always great to see how these big commercial Drupal sites are stitched together.  This is a good case study.

Still bewildered by your TinyMCE configuration and why you can't quite get it to do what you want?  This is a good beginning tutorial for setting up TinyMCE using some of the newer modules available.

The SMS Framework module is part of the notifications system in Drupal.  This can be very powerful in conjunction with wireless devices.  Development Seed tells you about using  improvements in the module that allow for double opt-in.

Jeff Eaton of the Lullabots explains how to solve some of the classic web problems in Drupal.

How do I theme my blocks according to function, rather than according to placement?

Nice HOWTO and introduction for people trying to figure out theming issues for JCarousel and the Panes 2 Environment.

Configure the popular Windows Live Writer tool to post to Drupal through xmlrpc.

Nice presentation on using this combination to build web sites quickly.

Quick Howto on building a module to change the color scheme of nodes on a site.

Video Tutorial for using the Drupal input format system.

The scheduler module is one way to schedule the posting, unposting, etc. of content in Drupal. This screencast steps you through using the scheduler module.

Nice short article on Agile Approach about using the new views attachment API in Views 2.

Learn about the new features in Views 2 from Greg Knaddison (greggles) over at Mastering Drupal.

Short article on different modules that are helpful for building wiki-like pages in Drupal - From CivicActions.

A great tutorial showig you how to use emfield, feedapi, and feedapimapper to create video mashups on your site.