Last week a lively new commercial for the upcoming seasons of SG-1 and Atlantis debuted on Sci Fi. You can view it here (there are spoilers!):
BenBrowderPortal.com — download video (6 Mb)
YouTube.com — watch video
Also, the previous ads, including the “real life” ads, are up at Sci Fi itself. Visit SG-1 and Atlantis then click on “Watch Preview” in the Next Episode block to open the page of videos for each show.