Very good suggestion. I'd read him mention writing a book. Maybe if he sees this post he'll be reminded that young Padawans are waiting in eager anticipation. And, yes, if LW-ers could put together a nice workbook to go along with it, that would be fantastic.
I suspect that if the workbook came included with the book, a lot fewer people would buy it though. Possibly it could contain the address at which you could access the workbook online, and maybe print it out, although even such a trivial inconvenience could still be a barrier to a lot of people.
I think that it may be worth moving this article to the main page.
Note: This was originally posted in the discussion area, but motions to move it to the top level were made.
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My own desire to improve my rationality coupled with some posts criticizing LessWrong not too long ago led to an idea. For reference, the posts I mean are these: