Goosecross Cellars mentioned this informative 2009 Harvest Calendar in their blog update about this year's harvest. Not only does it show when things were picked, but what is happening to them now that they're fermenting (e.g. remaining brix in the Cabernet tank).
This was done using Google Calendar (free!) and framing the result (using HTML) on their Web site, so it's something that you could emulate next year with very little effort (each update is basically an all-day event on the calendar).
Best of all, Goosecross fans can subscribe to the Harvest Calendar with their blog/RSS reader, meaning that they don't have to come to the Goosecross Web site to see if anything is new.
A well-deserved shout-out to Goosecross for this excellent innovation using off-the-shelf parts! This is a winery which really does seem to embrace technology to tell the story behind their wines.