How about some video clips?
The first one up is "The Barsoom Segment," a 7-minute piece of a longer film called Blue Star Red Sand made by the Bournemouth Science Fiction & Fantasy Group in the early 1990s. While it may not have the bells and whistles of a big budget flick it still is an entertaining piece and fans of Barsoom I think will enjoy it. (More info and the pic above come from http://www.barsoomia.org/.)
Next up is the first trailer for next year's Green Lantern with Ryan Reynolds in superhero action, a brunette Blake Lively and our first glimpses of Mark Strong's Sinestro, Abin Sur and Kilowog. So far reaction seems split-some love it, others seem to think it looks worse and that Reynolds was a bad choice. For me it got my interest and for those complaining about Reynolds, considering that Warner Bros considered at various times both Jack Black and Justin Timberlake we should count our blessings.