Some c.str links
I was testing what enemies would eat close c.str, c.str xx tatsu, and ended up with some data that might be interesting. All combo attempts have been performed at SSF2X speed 3 (US/World ST speed 2).
Zangief: will combo, both punches can be blocked high, short tatsu will whiff. Also c.str, (s or c).fr will also combo, and can be finished with a hadouken.
Chun: str, str will not combo, second punch must be blocked low.
Ruy, Ken, Honda: tatsu will not combo (use - fierce only against the shotos - hadouken instead), both punches can be blocked high. Also, if the enemy is standing, c.str, s.fr will also combo, but I could not cancel it into anything.
Blanka: str, str will combo, no other special will after those, so c.str, c.rh xx short tatsu (for super bar) can help.
Guile: str, str will combo, both punches can be blocked high, tatsu will whiff (use any strength hadouken instead). If the enemy is standing, however, c.str, (s or c).fr will also combo (just like CPS-1 Ryu/Ken vs Guile), and can be finished with a hadouken.
Dhalsim: will combo, both punches can be blocked high, short and forward tatsu will whiff. Also c.str, (s or c).fr will also combo, but I could only cancel into a hadouken from c.fr.
T. Hawk: str, str will combo, tatsu will not (use hadouken instead), both punches can be blocked high. Also c.str, (s or c).fr will also combo, but I could only finish with a hadouken after c.fr or s.fr against a crouching opponent
Cammy: str, str will combo, tatsu will not (use hadouken instead). If she is standing, it is possible to do c.str, s.fr XX strong or fierce hadouken (I got jab to whiff once), but I find the timing quite strict. If she is crouching, one can use c.fr instead, but I find it just too situational.
Fei: will combo, both punches can be blocked high, short tatsu will whiff. If the combo is done at the wrong (too far) distance, the second puch must be blocked low, but then the tatsus will never combo. Also c.str, (s or, preferably c).fr will also combo, and can be finished with a hadouken.
DJ: punches will not combo on standing DJ, second punch and special attacks (any) will not combo, also. If crouching, punches will combo into fierce hadouken, only.
Boxer: punches will combo, short and forward tatsu will whiff. If the first punch is blocked, the second will whiff if the opponet remains blocking high. If crouching, a single c.str will combo into any strength tatsu, but a 2-hit str combo will not. Also if crouching, the punches will only combo into fierce hadouken. The c.st will combo into c.fr anywhere, and into s.fr on corner (only, it looks like), against standing boxer. The c.fr can be followed by a strong of fierce hadouken for a combo anywhere, and by jab hadouken on corner. Against crouching boxer, c.str will combo into the far version of s.fr, and will not combo into c.fr.
Claw: punches will not combo against standing Claw, the second one may need to be blocked low, if the blocking string is not started close enough, as it should. Against crouching Claw, punches will combo into any hadouken. A single c.str will not combo into any fierce.
O.Sagat (didn’t test turbo version): punches will combo, both can be blocked high, short and forward tatsu will whiff. Can also be followed by any hadouken, instead. If the second strong is substituted for a (crouching and standing) fierce, hadoukens (or tatsus, of course) will not combo. If crouching, O.Sagat can be hit by c.str, c.(str of fr) xx hadouken (any strength), for a 3-hit combo.
Dictador: punches will combo, tatsus and jab or strong hadouken will whiff. Both punches can be blocked high. If crouching, any hadouken will whiff, but the fierce one against a cornered opponent. If standing, c.str and s.fr (far version) can combo.