I'm halfway through the trailer when I think "OMG! They totally ripped off The Omega Man!" and I'm already planning my scathing post on the subject when I think maybe I should do some research before I go spouting off.
It's turns out that both films are adaptations of the 1954 novel by Richard Matheson.
I don't know if I'll get the chance to catch I Am Legend in theaters, but I'll definitively check out the DVD release.