I have a wide variety of online writing experience. I've written for my own blogs (centered on technology and video games) where I concentrated on long-tail keywords.
I also have over 300 published articles through Demand Media, showing that I can produce keyword-relevant content quickly, and to desired lengths and quality.
In addition, I also write occasionally for news sites, so I can come up with things like press releases and news articles quickly.
I also have a great deal of experience writing fiction, with several published short stories under my belt.