I was reading your tutorial about block spinning and it look pretty impressive. I am using Autofill magic for around one year but never tried block spinning. However, I have one question.
How many paragraph variations along with sentence variations will be needed to post unique and human readable articles in 40 web 2.0s?
It can be intimidating and "labor intensive," building a decent sized article with block spinning in mind, but it is so fucking worth it. SO FUCKING WORTH IT. That feature alone, could support itself to be sold as a stand alone product.
I'm not a content generator myself, so what I do, is I'll find a POPULAR article, and put it into a raw text editor. Then as the tutorial explained, rewrite the same sentence to mean the same thing. So I rewrite, word for word, each sentence. I do anywhere from two, to five variations. Depending on how early on in the article I am.

Then I break the article up into the blocks that can support themselves as a stand alone blurb (think 50-200 words).
THEN you go in and can manually add your {standard|regular|unique|similar} spintax, to chop the sentences into tiny little pieces. Don't forget to make sure each of the { } are present, and the "use block spinning" is checked. Otherwise you'll break the entire article (without the { }s present)
If you take 1 week and work on it a couple hours a day (depending on the size of the original article), you will have a SUPER SPINABLE article, with virtually ZERO grammar issues. And wherever you want to do keyword stuffing, you can do a keyword, and a bunch of LSI too!
I just finished one that was originally like 800 words. I deleted about 325, as there was a section I didn't want to touch upon, and I went a bit further in depth, and it finished up, as a 2800 word document. This amount, spins into anywhere UPTO 1100 words. I have an intro, and a conclusion, where I keep my link. Everything in the middle is random.
I cant say enough good things about that feature.