Server.com

Server.com has, besides what would have at one time been considered a great domain name, a collection of web apps for site owners -- discussion, calendar, PIM, generic forms, etc. They're all hosted on their site, somewhat customizable, incredibly basic, free, and without banners. They don't even have a concept of accounts -- just a password for each app. On the plus side, they're simple, easy to get started, and quick-responding. Here's an Evhead discussion forum. Here's a calendar. Though I didn't see any banners, apparently they have some (at least in the plan): "WebApps are a FREE service, paid for by the banner ads we include on WebApp pages. If you would like to use WebApps without any banner ads, we offer a leasing agreement that allows you to pay a yearly fee in exchange for an bannerless version of a WebApp." They won't be able to sell any ads for these types of pages, of course, so hopefully they'll just start charging money and be able to make a real business of it.