Arguments against Performance-Enhancing Technologies

On my blog, I've posted a work in progress for a sports ethics presentation I am working on. The post is an analysis of the arguments against performance enhancing technologies/drugs. I'd be interested in getting some feedback, either here or on my blog.

www.philosophyblog.com/2008/06/arguments-against-performance-enhancing.html

(Usual caveats: this is more of a rough outline rather than coherently written article)