Gathered from various websites on the net, these seem to be the most interesting and untarnished facts on the number 42:

The ASCII code for 42 is the asterisk: *, which we all have used at one time or another as a shortcut for "everything".

42 degrees is the angle of refraction in a water droplet which creates a spectrum, or rainbow.

42 in binary is 101010. (as already stated above)

A pair of dice have a total of 42 dots.

42 is the natural vibration frequency of human DNA. I'm not sure of the details on this one. Is it Hz, or what?

A barrel of oil contains 42 U.S. gallons.