Do you like SFZ2? Do you want to learn how to use Guy in this game? Keiko has made a very interesting guide into the combo development of Guy, which covers basic combos into more in-depth advanced badassery.
Vid covers basic, chain combos, anti-airs, advanced combos, meaty combos and some combos after throws.
If you want a full transcription of the combos please check his site http://streetfighterzero2.blogspot.com/2010/09/character-combo-review-chapter-01-guy.html