Combo Video Extraordinaire Maj from Sonic Hurricane has recently been cranking out some great Ryu combo videos that demonstrate various aspects of the SF4 combo engine.

From the description:

0:11 The first hit of Ryu’s j.MP creates a free juggle state every time, so if you can avoid connecting the second hit, you can follow up with anything. Dhalsim’s j.LP is a useful setup because it allows you to hit him at the top of his arc from the end of yours. It would’ve been nice to juggle with a Focus Attack but it’s too slow, so i went with Ryu’s c.HK instead. Juggling sweeps is always cool.

His most recent video is the first of a series of combo video challenges, again focused on Ryu, where he tries to get Ryu’s Ultra damage scaled down to 5 points each:

Great work Maj!