Below is the link to watch the 47 minute BSG Sci Fi Channel Upfront panel (March 18, 2008).
http://video.syfy.com/shows/battlestar/behind_the_scenes_3/featurettes/battlestar-galactica-upfront-panel/v231554
NOTE: The above video will not play for people outside of the USA. But there is a work around so that you can watch it.
Read the comments in this thread by positronika for the instructions.
http://battlestar-blog.livejournal.com/882247.html
BSG’s Michael Hogan and Aaron Douglas on being Cylons
Video Description: Actors Michael Hogan (Col. Tigh) and Aaron Douglas (Chief Tyrol) discuss how they leared their characters were sleeper Cylons, and how it changed their performances. From a press conference at Sci Fi Channel upfronts, March 18, 2008.