I was just looking for information on old wallpapers on the web trying to date a wallpaper in my old dolls house and I stumbled across the following YouTube video from a Kit Laybourne at Oxygen Media (with the Cooper-Hewett National Design Museum) called 'Wallpaper That Moves'. It basically covers 300 years of wallpaper in 3 minutes. Very clever and a good quick reference.
Unfortunately it didn't help me identify the wallpaper in my dolls house. I'm still looking!