general deinterlace and ivtc tutorial needed

Since such a tutorial does not exist, you should research and write one. :)

Look in the 2.5.7 avisynth release's documentation, under docs/english/advancedtopics/hybrid_video.htm to find whatever the most recent update wilbert and I had was. I wonder what happened to the wiki page on it? Man, with the lost 3 months or so, I'm all confused about what's in it and what isn't. Now that I see it's just not in there at all, I'll reupload it. It still needs a lot of editing though, and I'm way too tired right now. There's also a couple parts that could stand to be updated with new tools, the mp4 timecode ones in particular, but for the most part I don't see much that's changed in the last year. How to integrate it into the workflows of various GUIs would be a good topic though. Of course any clarifications, revisions, simplifications, etc are all welcome. (If you want to see how cruel its methods used to be, see the old page, which came with 2.5.6.)

I'll check out the docs you mentioned. Thanks for the link too, but I didn't really find the info all that useful since it's just suggested scripts with little explanation of how and why they're written they way were.