You know, it was worth suffering through the abysmal Skiffy flick - SHOWNDOWN AT AREA 51 - to catch this ad. Yes, SciFi Channel put on an ad for the second half of season 4 of Stargate Atlantis. It's right below, and opening the video will expose to a TON of spoilers, so you've been warned. If you don't mind spoilers, ENJOY! Done by aiming digital camera at TV screen, so not high tech ;)
UPDATE: Screencaps from video now up at next post.