Street Fighter has such a long, rich history. I remember seeing Street Fighter II in the arcade for the first time and be awed at the gameplay and diversity of characters you can be. I took it upon myself to learn every single character so that I could play against some of the best at the local arcade I frequented.
The 25th Anniversary game had an hour documentary on the series and you can view it now. If you have an hour or so to spare, check out a nice history of the series.