I pick and freeze around 120 lbs. of tomatoes each season...just wash 'em off, let them dry, and throw them in the freezer. When I need them for something like AnnaG's yummy-sounding chowder, I just do what Anna said...but, the frozen tomatoes shed their skins almost instantly and it's easy enough to carve out the "navels" too. The frozen tomatoes taste really fine, probably because they're local and not the store-bought variety that were likely bred for surviving a long ride in a truck vs. good flavour, etc. I find the local ones have really thin skins and, once again, taste like tomatoes!
And AnnaG, thanks for the recipe! I'll try it...soon...I'm hungry!