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Mathematics

Yahoo Answers: Mathematics is mostly filled with lower level Q&As, but has some occasional nice questions.
MathOverflow, a nice site for graduate-level questions.

Chess Variants

Lots of (easy) applets: Ed Friedlander's site
Even more variants, plus some analysis: ChessVariants.org
3+ dimensional analysis: CV Wikidot
A partial list of my favorites:

My own 4D game, and some thoughts: Chess-Basics