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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Holy cow, I need to learn me some RegExp. I certainly went overboard on this one. Solid, fun, and teaches a valuable lesson.
I would really like to see the integration of multiple languages. For example, with jQuery you can easily combine DOM Manipulation with ajax calls. Being able to create Kata that asks you to interact with a "server", and manipulate DOM based on the response would be really cool. The biggest issue, as far as I can tell, is adding a preview window for the rendered page.