Let's Learn from Examples
Every programmer had experience about "Hello World". All the examples listed here are "Hello World" on it's own, it is simple enough so that people who have no experience with the topic can easily understand it. You can modify the code, test the result or copy the code and try it. They are not "code snippet" but standalone and complete example. Enjoy it.
Challenge How to: Retrieve specific header information with AJAX
Challenge How to: Retrieve the content of an ASP file
Challenge How to: Retrieve content from a database
Challenge How to: Retrieve the content of an XML file
Challenge How to: An AJAX example with a callback function