From an actual practioner, that is someone who works in a corporation and spends their time doing marketing for a living.
I for one was beginning to give up hope!
Here’s the URL from a guy named Sam Decker who works at Dell. Even more impressive … people actually leave comments on his blog. Most of the marketing blogs out there don’t seem to solicit any response at all, ours included. Of course this may be a function of the size of the Dell marketing community, which has the critical mass to get and keep a conversation going. See especially this entry on Six Sigma and its applications to Marketing.