Agile Austin has put together a nice collection of resources for learning agile development practices: http://www.agileaustin.org/agile-resources/
It recommends books, websites, listservs, blogs, videos, and podcasts, to support many learning styles. It also links to tools that members have recommended for use with agile.
Tip: If you're considering buying any of the books listed, click through the link on this page so that Agile Austin gets a bit of the proceeds from Amazon, which it puts toward creating more opportunities for our professional development in agile.