I have actually had several articles rejected by Info Barrel for keyword stuffing, even though I had no intention of even attempting to use keywords. I just wrote the article naturally and fluently, just as I would if I was speaking about it to someone. That seems to be a regular thing at Info Barrel. Sometimes I think they just use it an excuse to not publish content they don't want. It's probably worth going over my older articles, reviews and tutorials and checking them for keyword stuffing, what with all the changes Google keep making to their algorithm.