Yukino Scramble vol. 1, one of my best finds!
This may sound absolutely crazy, but I literally just uncovered around 70+ chloroform scenes (all from doujinshi and manga) in the span of 4 days. That has to be some world record or something. I mean I was turning up chloro scenes left and right! I had some help of course...
An old japanese site called "Time to Sleep" has a database of manga chloro scenes (only titles and authors...and it's all in japanese!). The site is in my links page. I went through the list and just Googled the manga titles, seeing what I could find. When a title turned up something, I looked it up on mangafox.com or some other raw manga site (manga scans are all over the internet now). e-hentai.org contained around 90% of my haul.
A good samaritan over at e-hentai.org actually tagged the doujins that had chloro scenes in them! There were around 76 titles tagged with chloroform last I checked. Most were new, never before seen chloro scenes. It was a goldmine. I even got lucky occasionally and there would be a second chloro scene in the same issue. Yukino Scramble vol. 1 had TWO chloro scenes in it.
I'm telling you guys, manga is where all the good stuff is now. Checkout some manga scans websites (email me if you want some links). There is an endless supply of KO scenes.
So what a great way to end 2009 eh? This is my gift to you. Have a Happy New Year and keep looking for scenes!