Agile Project Management Tools 

ExtremePlanner

Web-based agile project management software. Supports Scrum and XP, and is very easy to setup and get started with. No additional software is needed.

Version One Software

Another Web-based agile project management tool. .Net based, offers a hosted version of the software. Runs under Windows IIS with SQL Server as a database.

Rally Software Development

A hosted web application offering for agile project management. Rally also offers consulting and training in agile methods.

XPlanner

Open source project management software for Extreme Programming. Does require some substantial setup, including installing a database and compiling a version to work with that database system.

Agile Project Planning Tips 

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Useful Agile Newsgroups 

Scrum Development Yahoo Group

Scrum newsgroup with crossover for agile discussion in general.

Extreme Programming Yahoo Group

Extreme Programming discussion group, lots of general agile discussion, help for newbies and experts alike.

Agile Usability Group

Usability discussion group, with an Agile focus. Low traffic, but high quality disucssions.

Books on Agile Project Management 

Agile Project Management with Scrum (Microsoft Professional)

by: Ken Schwaber

Amazon Price: $26.39 (as of 11/21/2008)

Planning Extreme Programming (XP Series)

by: Kent Beck, Martin Fowler

Amazon Price: $32.07 (as of 11/21/2008)

Managing Agile Projects (Robert C. Martin Series)

by: Sanjiv Augustine

Amazon Price: $45.04 (as of 11/21/2008)

Agile Project Management: Creating Innovative Products (Agile Software Development Series)

by: Jim Highsmith

Amazon Price: $43.35 (as of 11/21/2008)

User Stories Applied: For Agile Software Development (Addison-Wesley Signature Series)

by: Mike Cohn

Amazon Price: $40.83 (as of 11/21/2008)

Extreme Programming Explained: Embrace Change (2nd Edition) (XP Series)

by: Kent Beck, Cynthia Andres

Amazon Price: $32.24 (as of 11/21/2008)