In the same style as the SF2 hitbox investigation (shown at http://combovid.com/?p=956), here is some hitbox discussion on the Street Fighter Alpha series.
http://combovid.com/?p=1405
I'm a real sucker for this kind of stuff, I reckon it's awesome :)
How do you best make use of hitbox info?
This is more just interesting than really useful, although the text (especially from the SF2 hitbox page which explains things) should help you interpret hitboxes.