I found the blog Agile: In A Flash some time ago and I really like it.
The blog discusses agile software development based on flash cards. The authors put together cards that each express a single idea, practice or methodology in agile software development.
Go and have a look!
Now it’s not just a blog anymore. We finally realized our vision of making a full deck of cards at an affordable price for agile developers, coaches, managers, scrum masters, and teams.
http://pragprog.com/titles/olag/agile-in-a-flash