Well, the date has been set - May 2, 2009 for the first World Wet Plate Collodion Day.
Mark Zimmerman suggested this idea on the forum board a few weeks ago. I think it's both a brilliant idea and a fun thing to do.
The idea is to honor a process that's given so many a new lease on creativity and generated so much excitement in photography. I'm going to try and make a couple of nice plates here in Germany on that day.
It would be great to see a publication from the work. I think it would be a nice community building thing to do, too. I'm thinking a simple Lulu (for cost) book - buy it or not kind of publication. It would be less that $25 USD to purchase it. No politics, commerce or strings attached. An annual publication from images all over the world would be so cool!