Yes and no. It certainly qualifies as a diary, going back to
1999 1998. Talk about dedication! But it lacks an RSS feed, which means people can't subscribe to it to receive automatic notification of new/updated material. I wonder if Dave Coffaro, clearly a blogger in spirit, would consider using a more modern tool like TypePad, WordPress, or Blogger?
Regardless, I've added The Winemaker's Diary to our list, with the "no RSS feed" caveat. Joe Bob says, "Check it out."
(Coffaro sells most of their wine as "crazy futures", which is an interesting approach to problem of making money from wine.)