the integration with local.yahoo data is pretty slick. excellent interface also. I haven't looked at their api and how easy it will be for developers, but if they one-up google on that aspect as well it makes for a very impressive offering.
sorry MoneyMan, don't want to hijack...but they also have a preview of what kind of app can be build w/ their maps api & a little upcoming.org (i assume) info. very cool, I think I need to check out that web 2.0 thread again.