Curiouser.co.uk
Features a selection of paradoxes, paradoxical puzzles, games, illusions, tricks, poems, quotations, facts and ideas.
http://www.curiouser.co.uk/

Puppeteer's Cosmic Puzzle
Explore the meaning of familiar playing cards and a world of new cards through the Codex, games, archives and lore.
http://www.cosmicpuzzle.com/