Warner Bros. have released a video of SDCC Green Lantern highlights, including Ryan Reynolds saying the Green Lantern oath.
Video highlights from Green Lantern panel July 26th, 2010
Ryan Reynolds talks Green Lantern October 11th, 2009
Ryan Reynolds recently appeared on Late Night with Jimmy Fallon, where he talked very briefly about his upcoming role as Hal Jordan. The footage is on Hulu (you need to be in the US to watch this) and the gritty bit begins around the 21 minute mark. Video via SHH.
Excellent fan made Green Lantern trailer June 2nd, 2009
With Nathan Fillion fictionally cast as Hal Jordan in the Green Lantern movie, this fan made trailer, created by Jaron Pitts, is an awesome vision of what the franchise could be: