In 1977, Diffie and Hellman proposed a machine costing an estimated US$20 million which could find a DES key in a single day. By 1993, Wiener had proposed a key-search machine costing US$1 million which would find a key within 7 hours.
One of the more interesting aspects of COPACOBANA [a DES cracking machine] is its cost factor. One machine can be built for approximately $10,000. The cost decrease by roughly a factor of 25 over the EFF machine is an example of the continuous improvement of digital hardware—see Moore's law. Adjusting for inflation over 8 years yields an even higher improvement of about 30x.
DES hasn't changed, but the amount of computational power attackers can bring to bear has.
Or to put it a different way: archers manning a castle's walls were a decent defense against melee soldiers
Turn off your computer and make sure it powers down
Drop it in a forty-three-foot hole in the ground
Bury it completely, rocks and boulders should be fine
Then burn all the clothes you may have worn any time you were online!
Do it now "before it emails your grandmother all of your porn."
Real Users are afraid they'll break the machine -- but they're never afraid to break your face.