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Magic Squares might also be applied to words. I'd previously had some fun finding some four by four squares by hand, when, out of interest's sake, my friend and I coded a small program to find the silly things for us. We used a fairly standard Unix English dictionary, although I believe my friend added five or so *cough* choice four-letter words. The only rules we used were that each word had to be unique, taking the transpose (switching rows and columns) was cheating, and the diagonals didn't have to make sense. The square above was the only six by six square found.
Here's the breakdown of the number of squares per dimension:
Two by Two: 46
Three by Three: 10734
Four by Four: 148250
Five by Five: 4872
Six by Six: 1
Seven by Seven: 0
Eight by Eight and beyond: untested