Impressive. Maybe there is hope for a good Green Lantern movie. Fan made or not, I hope the big boys pay attention to this. And Nathan Fillion is an inspired choice.
I've personally had enough with DC Comic adaptations, but I admit the trailer is cool. Green Lantern's environmentally conscious slant, the fact that he had a family, the fact that he was often paired with someone else, as well as the premise of the ring itself (at least originally, when it had to be rejuvenated every 24 hours or whatever) made him one of the lesser heroes in their fleet for me - just not dark enough a character to really grab my attention I guess.
It's a pitty we didn't manage to watch it. I am a big fan of comics and not so much into the Green Lantern character, but will definately check out the trailers and the movie.