Agile Software Development

Some resources on Agile...

Manifesto for Agile Software Development

Principles behind the Agile Manifesto

Agile Alliance
With more than 5796 members located around the globe, the Agile Alliance is driven by the values and principles of the Manifesto for Agile Software Development. Agile Alliance recommends agile approaches to software development because they deliver value to organizations and end users faster and with higher quality.

Agile blog
Great blog for Agile from the folks at Rally Software.

Scrum (development) at wikipedia

Mountain Goat Software
Scrum training and certifications.