Please oh please, will someone come play with me here:
It's a really cool idea and I'd love to see more people get involved. Here's the idea as pitched at The Land of Nod: http://matt-landofnod.blogspot.com/2010/11/megacrawl-3000.html
here are the characters: http://matt-landofnod.blogspot.com/2010/11/megacrawl-3000-cast-of-characters.html
Please oh please get on over there a couple of times a month and let's see what happens.