As part of Vista, the new Windows Live Hotspot Locator Wi-Fi SpotHot Locator Brand Brand Spot Brand Service Microsoft Hotspot Locator Finder helps find hotspots: It's no JiWire--disclosure, I own a tiny number of shares in JiWire--but it's, you know, Microsoft. So we know that whatever it's like today, it will get better and bigger, and huge amounts of money will be poured into it.
While the beta is out now, the integration with Vista will apparently allow some kind of connection between configurations and hotspots you find. They've integrated Virtual Earth mapping with the hotspot finder.
It's extremely easy to crash right now. Choose Advanced Search, United States, and check Airports. Click Search. Watch it go boom. Yes, it's a beta. Actually, right now, everything I do crashes it.