Support
Good support is very rare. As a mostly-free service, WordPress.com has hundreds of thousands of users who can sometimes send in quite a few question every day. To be completely honest, even we sometimes don’t have the answers. But we try really, really hard.
When you send a message to WordPress.com, there is a real human being on the other end who will read it and do his darndest to answer it. It’ll probably be one of these guys:

In addition to all of that, we have some pretty cool forums where you can chat with other WordPress.com users and give or receive tips and tricks.
