I'd say be wary of moonfruit... it's well known in the web design world for being an epic pain in the arse. If you're looking for something free, sign up for wordpress.com. It's really user-friendly, there's literally thousands of templates to choose from, and it's generally a lot better from a technical point of view.
There's also posterous, and blogger. They'll all do what you want, but I think wordpress is the nicest to use.