An interesting new patent pending design for a photon thruster appears to be the real deal. Check out the article and who is behind it. (A fellow SRI alumnus!). Getting to Mars in a week means getting to the moon, as well as other nearby planets would be quite fast as well. This could be quite revolutionary.
TUSTIN, Calif., Sept. 7, 2007 — An amplified photon thruster that
could potentially shorten the trip to Mars from six months to a week
has reportedly attracted the attention of aerospace agencies and
Young Bae, founder of the Bae Institute in
Tustin, Calif., first demonstrated his photonic laser thruster (PLT),
which he built with off-the-shelf components, in December.