An RSS item today—
 Diamond squares Fri Aug 19, 2011 05:36 [EDT] from Peter Cameron
If you like Latin squares and such things, take a look at Diamond Geezer’s post for today: a pair of orthogonal Latin squares with two disjoint common transversals, and some entries given (if you do the harder puzzle).
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The post referred to—
"This Jack, joke, poor potsherd, ' patch, matchwood, immortal diamond,
Is immortal diamond." —Gerard Manley Hopkins, Society of Jesus
Those now celebrating the Catholic Church's "World Youth" week in Madrid
may prefer a related puzzle for younger and nimbler minds: