For the record, here it is: http://flask.pocoo.org/
Without having seen it yet, one thing I'd love to see is "Flask for recovering Djangonauts" or something similar, in addition to how to use Flask at scale. Basically, best practices, advice, and some good libraries for someone who doesn't want ALL the batteries included in their framework, but also would prefer some more reliability than randomly slapping some libraries together and hoping for the best. The intimidation of not having true official integration for a lot of Flask plug-ins is what has kept me from doing anything at scale with Flask so far, recognizing that this is not necessarily a valid concern.
I'm the author if anyone has any questions. If you have some feedback, I'm looking forward to seeing bug reports on GitHub: https://github.com/rpicard/explore-flask
I've considered doing an HTML version, but I haven't put a ton of thought into it.