The topic has come up a lot recently because ilitirit and myself have been doing some labwork, but we just end up posting it in whatever random thread that the discussion is currently going on in.
I plan to compile everything I can here that seems pretty useful. Sorted sections of what setups work on who will be posted shortly.
Character specific stuff
Frame data that isn’t in the frame data
notes are in (),  is contributer.
f.throw, nj, j.hk - works on Juri, Ibuki, Makoto, Rufus, Dictator, Fuerte (does not work against U2) [ilitirit]
f.throw, f.dash, f.dash, nj.hk - works on Juri, Ibuki, Makoto, Rufus, Dictator, Fuerte (does not work against U2) [veserius]
f.throw, f.dash, f.hop, nj.hk - Works on 4+ Frame Reversals
f.throw, f.dash, f.hop, crossup j.mk - Works on 4+ Frame Reversals
f.throw, mp ball, j.hk - Works on 5+ Frame Reversals
cr.hk, st.jab, j.hk - works on 7+ frame reversals
Meaty setups ending in cr.lk/cl.mp are +3 on block/+6 on hit, cr.mk is +3 on block/+5 on hit
cr.hk, whiff j.hk, cr.lk (1)
cr.hk, whiff j.hk, cr.mk (1)
cr.hk, whiff j.hk, cl.mp (2)
cr.hk, f.dash, f.dash, cr.lk (1)
cr.hk, f.dash, f.dash, cr.mk (1)
cr.hk, f.dash, f.dash, cl.mp (2)
cr.hk, f.dash, f.hop, cr.lk (2)
cr.hk, f.dash, f.hop, cr.mk (2)
cr.hk, f.dash, f.hop, cl.mp (3)
cr.hk, f.hop, f.hop, cr.lk (3)
cr.hk, f.hop, f.hop, cr.mk (3)
2=Sagat/Cammy, if tried against other characters(except Blanka/Adon) will give 1 less frame advantage
Misc Frame Data:
?cr.hk(first active frame) - 48 frames.
Exceptions: Adon(41 or 42 frames?) Cammy/Sagat(49 frames) Blanka(50 frames)
If you do not hit on the first active frame Blanka will recover 1 frame faster for each frame past the first one.
?f.throw - 81 frames
Exceptions: Adon(??), Juri/Ibuki/Makoto/Rufus/Dictator/Fuerte/Ken/Ryu(80 frames), Cammy/Sagat(82 frames), Blanka(83 frames)
Why Hop Mixups Suck Against Standing Opponents:
Rockcrusher xx f.hop
Cr.mk xx f.hop
Light Attacks xx f.hop
block - 12
Doubletap Ultra 1
Commonly combos into ultra are 1 frame links, and you lose the ability to doubletap because if your first input actually did hit the ultra, your second one will cancel out your ability to hold the ultra and thus get full hits. Against a small number of characters however you don’t need to time your ultra and instantly releasing the buttons allows you to still get full hits at close proximity. So against these characters you can double or triple tap your ultra input to increase your chance of hitting the link reliably.
Ryu, Ken, Honda, Guy, Blanka, Fei Long, Rose[ilitirit]
I would say U1 would be the ultra of choice against all of those characters other than Rose, and you should have good chances to hit it against them in the normal course of a match.