From the jQuery site: "jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages".

jQuery is also the base Javascript library in Drupal.

Also see the Weblink to PQuery.

What I refer to as 'The Project' is one of those life challenging mega-projects that a barrel full of Bill Breitmayers couldn't complete in 20 years. But, it's a start ...

More on Drupal Performance Tuning and Optimization for large web sites.

One of the main Drupal articles on Server Tuning Considerations.

Drupal's Performance and Scalability forum. 

 An interesting article: Drupal Performance Tuning and Optimization for large web sites.

Excellent discussion of CakePHP core classes, particularly the Dispatcher class.

Relationship Module ( CVS Repository )

Discussion about relationships and set theory

Cook up Web sites fast with CakePHP

Adding related information and services

Bake bigger and better with CakePHP

Use Sanitize for your protection

Use CakePHP's Session and Request Handler components

Updated Oct 3 2008:

Libraries and a toolkit for developing semantic web applications using MicroSoft .NET technology. Not open source of course, but their developer documentation in interesting.