Just ordered a FON router...
If you haven't yet heard about FON, it is a startup (heavily backed by both Skype and Google) that aims to spread consistent wifi service across the world. They have developed custom firmware that runs on a Linksys wrt54g (the linux version), and are selling a limited number of those routers at a significant discount ($33 shipped, I just got one of those). There are three FON user profiles: Linus, Bill, and Alien (these guys are geeks :)).
From the FON site:
A Linus is any user who shares his/her WiFi in exchange for free access throughout the Community wherever there is coverage. A Bill is a user who, instead of roaming for free, prefers to receive 50% of the fees that FON charges to Aliens. And Aliens are those users who do not share their WiFi access and therefore must pay FON a modest fee every time they connect through a Fonero access point.
So by sharing my wifi connection (I get to specify how much bandwidth to set aside for visitors), I in turn get free access at any FON hotspot around the world. Or if I'm not in the travelling mood, I could go Bill and make some cash instead. Two things that are bother me a little about this: no WEP/WPA on the wireless signal, and it is unclear as to whether I will be able to easily segment my lan off from the outside world. Oh well, I'll find out soon enough.