I've always had an interest in Chun-Li, and now that I have a stick, decided to go back and watch an old episode of NSB TV! with Y24, the Chun-Li player. It's from about six months ago, so you might have already seen it, but he shows off a lot of his input tricks for Chun. I listed time stamps and partial inputs below, but to really understand how he does each, you should watch the video.
NSB TV! 10/26/2011 - Guest: Y24 - Training Mode
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38:52) Landing EX Hyakuretsu from a single cr.LK (LK, MK, HK, LK, MK+HK).
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40:40) Meterless Hyakuretsu combo from cl.HK (HK, MK, LK, HK, HK, LK, MK, MK...). Chun-Li's Super Combo is very useful, so you might want to save your gauge. With full hits, this combo puts Chun at +7.
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41:57) Linking into Ultra Combo 1 from the above listed combo with plinking (LK+MK+HK~LP). Normally the above input will give you a throw because of the LK~LP plink. But if you do the UC motion then immediately go to
down-back while doing the plink, you'll get the proper KKK input. If you input the buttons too early, you'll end up with a simple crouching guard.
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43:40) EX Hyakuretsu buffer during st.MP (MP+LK, HK, MK, LK) to beat Focus Attack. If your opponent focuses the st.MP, input MK+HK and you'll get EX Hyakuretsu. You can also use this to punish FA fireball absorb → forward dash. If the opponent does back dash or simply guards, you get a simple whiff st.MP.
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47:00) Landing the cr.HP xx Hyakuretsu loop (HP+MK~LK, LK, MK, HK). He plinks the first part hitting LK with his thumb, but for the last three hits, he switches his hand position, using his index finger instead of his thumb for the second LK. Switching fingers is technique also using in piano, keeps your fingers from getting tired.
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55:15) Landing cl.HK xx HK Hyakuretsu FADC cl.HK xx Hyakuretsu. By holding forward during the kicks, you only need to input forward once during the EX FA to get the dash cancel.
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56:20) EX Hyakuretsu from forward dash (HK, MK, LK, MK+HK~LK).
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58:23) He also mentions that he practices the Hyakuretsu loop by closing his eyes and trying to land the combo based just on time, for about five minutes before he goes to sleep.
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1:00:32) Even he finds landing raw cr.LP xx EX Hyakuretsu incredibly difficult. You can always do a link into EX instead of cancel however, which is significantly easier.