It's been a good 26 years for Capcom's signature brawler franchise Street Fighter, and through the years there's been a number of sequels, upgrades, spin-offs, crossovers, and just about anything that involves our favorite world warriors. The latest build and release, Street Fighter IV, will be getting its latest upgrade next year with Ultra Street Fighter IV, bringing with it some new fighters and some new mechanics to add some new dynamics to the franchise before an eventual new sequel turns over.
Meanwhile, Events Hubs (as shown from Kotaku) has created this excellent visual graph of Ryu's evolution wit each installment and spinoff from the Street Fighter franchise.
And here's something nostalgic from Sonic Hurricane...SF? Ryu Exhibition (Evo2k9+OHN8 Edition).