I just ran across a new blog called, in fact, WineryProfitability.com. Steve and Kelley Richards have been posting since February of this year, and have about a dozen long-form posts on a variety of topics. I particularly like Kelley's "customer perspective" posts.
Steve works for Farm Credit in western New York state, and has a Winery Benchmark program which may be of interest to my readers in that area of the country.
It's worth checking out their blog -- with only a few posts, you can scan through it pretty quickly and see if it interests you.
(Remember, if you use a blog reader, it's easy to follow lots of blogs because you don't have to check each blog yourself.)