This was posted on Capcom USA's blog the other day, a whole archive of the 'secret files' which were promo flyers, posters etc. included in the arcade kits for Capcom's games. Some really nice artwork here, check it out if you're into fighting games!
http://www.arcadeflyers.com/?page=videodb&name=sf&year=&manu=10&source=&submit=Search+the+Archive
I was browsing through these like a month ago. My favorite one is the big poster with the whole Street Fighter universe having a day in the park!
http://www.arcadeflyers.com/?page=flyer&db=videodb&id=3558&image=4 (http://www.arcadeflyers.com/?page=flyer&db=videodb&id=3558&image=4)