Another thing about the focus attack.
It seems that each character gets moves designed specifically for breaking the super armor in a focus attack. Supposedly to prevent people from just randomly throwing them out. These are from the official Japanese site.
Ryu: Hurricane, EX Hurricane
Ken: Hurricane, EX Hurricane, Ultra
Chun: SBK, EX SBK, Ultra
Guile: Flash Kick, EX Flash Kick
Viper: Knuckle, EX Knuckle
Abel: Wheel Kick, EX Wheel Kick, Super, Ultra
Fuerte: Headbutt, EX Headbutt
Rufus: Spin, EX Spin, Super, Ultra
Balrog: Low Rush Upper, Overhead Rush, TAP, EX Low Rush Upper, EX Overhead Rush, Super, Ultra

Vega: Flip Kick, EX Flip Kick, Ultra
Sagat: Tiger Knee, EX Tiger Knee
Bison: Psycho Crusher, EX Psycho Crusher
Honda: Headbutt, EX Headbutt, Ultra
Dhalsim: Yoga Flame, EX Yoga Flame
Blanka: Horizontal Ball, EX Horizontal Ball
Zangief: Nothing