The Great Martian War is a forthcoming pseudo-documentary by The History Channel detailing the events of a fictional Martian invasion a la War of the Worlds. Questions of veracity and taste aside, the effects in the trailer actually look pretty darn good, with footage either aged to seem early 20th century, or with CGI Martians composited into historical footage (it's so good, it's hard to tell which approach is used). I actually really like their interpretation of the biology and technology of the extraterrestrials. Their walkers seem suitably gawky with a pleasing mix of mechanical and biological elements.
The Ladytron-esque chiptunes soundtrack on this trailer, by Goldchimes, is pretty ace too.