Slashdot linked up this New Scientist collection of 13 things that "do not make sense". I'd heard of about half of them, but the others were pretty cool.

One note on the Ohio State "wow" signal: according to a SETI astronomer I heard at a convention in Nashville in 1994 (can't recall the guy's name), more than twenty years after the signal was recorded it was realized that Jerry Ehman had made a mistake when he noted down the location of the signal. All these years they'd been looking for it in the wrong spot. Of course, when they looked in the corrected area, no signal there either.