Gutenberg Gem: Amusements in Mathematics, be H.E. Dudeney
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A classic of puzzles (most of which I would call only marginally mathematical) Amusements In Mathematics, by Henry Ernest Dudeney. has been made available via Project Gutenberg. Lots of puzzles having to do with geometric dissection, board games, and a host of other topics. Very nice.
I recall burning three or four weeks of a sabbatical getting Saccade.com on the air with Wordpress. So much tweaking…