In the past, many Sonic games have been released and many notable, more recent games have had trailers to accompany them and/or TV Spots/Promotional Videos. In your opinion, name some very successful trailers and/or TV Spots for some Sonic games... if you can remember them that is. :P
Next-gen game trailers can be included as well.
For me, though, I've only seen the STH Promo on TV.