Maybe some of the phone calls to county govt folks could be replaced with emails. It would be cool if we could point them to an "official" event blog for more info. This thread is probably too informal. We've got to do a good job selling the project. The county officials should get a public pat on the back for helping us. Heck, we might even be able to get some free advertising via the evening news!
Windows Live allows users to create "event" pages and invite people via email. I've only played with it a little, but it seems decent -- plus it's free!

City governments might also help with the effort by soliciting volunteers from their ranks and/or provide supplies and cover disposal fees. Ya never know...

What areas are we going to clean up? Many lakes are surrounded by private property. Most people who own lakefront houses would welcome people who are making free improvements, but it would still be a good idea to get prior permission. Trash cleanup at most parks and boat launches is already being done. Should we focus on smaller, unimproved bodies of water?