I was one of the people who gave it a try. You can read the results over at...
http://wired.com/wired/archive/14.11/sixwords.html
I think my favourites are
Machine. Unexpectedly, I’d invented a time
- Alan Moore
and
It’s behind you! Hurry before it
- Rockne S. O’Bannon
and
Osama’s time machine: President Gore concerned.
- Charles Stross
and also
The baby’s blood type? Human, mostly.
- Orson Scott Card