If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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This, I assume? (It took me a few tries to find it since first I typed in the name wrong and then it turns out it's "Wardley" with an 'a'.) Is the video on that page a good introduction?
Damn, I had the "a" then changed it cause it looked wrong ' The video is a decent introduction. however, if you'd like to learn how to actually use them, a great resource is this free book: http://www.wardleymaps.com/uploads/9/5/9/6/9596026/future-is-predictable-v14.pdf, which was compiled from Simon Wardley's blog, takes you step by step through understanding the process, creating them, and using them to create a coherent business strategy.
If you have time for it, his entire blog is worth a look: http://blog.gardeviance.org/