tangor - 11:12 pm on Nov 26, 2011 (gmt 0)
Ken_b... I've made no assumptions, but it does appear I've ticked you off without intention. For that I'll take lumps and apologize. As to the charts... they were included in the OP... which is why I'm a bit confused as the chart is self-explanatory (the way I read it) and didn't require a sentence to define it. As I said, no assumptions made and certainly no intent to ruffle feathers.
As for not native English speakers putting up English pages... this kind of scoring can be helpful during page development.
Target audience and topic will determine the number of syllables (word size) used, which is a major factor in the scoring for most of these formulas.
Occasional testing of spinner output through any of the above will give some indication of success for those sites which auto-regurgitate content.
Just suggesting there are some tools out there which can help in the creation and readability of content and make it easier to dial in on target audiences with best material.