So it looks like a company called SKYHOOK Wireless is powering the Wi-Fi location services in the the new iPhone 2.0 update. This is good news for first generation iPhone users as it adds really very good positioning to the cell tower service from the 1.0 release.
What was interesting to me was how they gather this data. They pay folks to drive around with one of their boxes (which I assume is a laptop of some sort with a GPS and a Wi-Fi antenna to record all positions of all Wi-Fi APs that are found along with strengths.
You can even earn some extra money by being a driver for them (if they need your area scanned or rescanned I suppose) by filling out their online form.
Let me know in the comments if you sign up and if you get accepted!