I am fascinated and have the same questions as you. Sorry:(
Yes - i 've used them - right now I am using the knit increase
(just like that , except knit instead of purl) on a shawl - it is the first and last stitch on each row.
Never saw this before, but its interesting.
I've never tried it before, but looks interesting so I'll use it next time and see how it looks
that is a new way for increases for me too. I have also never seen anyone knit that way. It is worth trying the increases, especially if you need to increase on a purl row which sometimes can be difficult
It looks as though they are not knitting into the back on the purl increase and not knitting into the front on the knit increase. I wonder how neatly it looks on completion. ?. I haven't seen it before either.
She's purling one stitch below and then purling the top stitch.
I have never seen knitting like that before. It looks like it would take longer to do.
My daughter uses these increases when making the toe of toe-up socks. They are pretty invisible, with no gaping holes.
That's how I do almost all of my increases. Doesn't leave a hole like some other methods do.
Looks like the "invisible" increase that I use whenever I can. She's showing it rather quickly, but it appears it might be the one I use, rather than the knit-front-&-back increase. You can see it clearer here: http://techknitting.blogspot.com/2007/05/very-nearly-invisible-increase.html
I use it when I don't want to see that little horizontal post that results from kfb, in the middle of my knitted project.
I use this method a lot. It leaves no holes
If you ever get directions that read knit (or purl) in row below, then knit (or purl) stich, this is it. As stated above, it does not leave a hole, and slants the article outwards. I usually use this for sleeves as my increases.