I've just ordered a FON router. I've been searching for a long time now for an invite. I've just noticed that GigaOM is giving away invites, and I didn't think twice before ordering my la fonera router. This invite makes it free (router and shipping costs). It has got a private network, that you may use at home, and a public one, that you should share according to the fon community rules. If there are any invites left, they can be found here. Use and abuse.
Update: How the community works, via youtube
Update2: GigaOM invites are over, but, due to FON's 1st birthday, they are giving away more router by their own. I'm already waiting for mine, spread the word! Get it here.