I had 3 before, all 3 quoted in the Freefall comics

Any sufficiently advanced technology is indistinguishable from magic.
Any technology distinguishable from magic is insufficiently advanced.
Any technology, no matter how primitive, is magic to those who don’t understand it.

Girl Genius has come up with another one though. :)

Any sufficiently analyzed magic is indistinguishable from science! 

(Or technology…)