Measuring text readability
Pete at Standards-schmandards has created a tool that lets you check the readability of your text. The tool, which will check documents in several different languages, is described in Methods for measuring text readability. The article also contains some basic guidelines for improving readability.
I have to admit that I have never before run any of my text through a calculator like this. I fed a few articles to the Readability index calculator and got Flesch-Kincaid Grade levels from 9 to 14 and Flesch-Kincaid Reading Ease scores from 44 to 58. What did your texts score?