The hardest part about planning a potluck party, or any other party where you are asking guest to "bring something" is making sure that you don't end up with twenty salads and no main dishes. mypunchbowl is a service that helps make sure that this doesn't happen. Using their service, you can create a list of the items that you need for your potluck party, and then send out an invitation to all your guests. Guests can sign up to bring items on the site, and this is then visible to everyone. This way your potluck party ends up with one of everything... no more all-salad, or all-desert parties!