Phil Wainewright over at Loosely Coupled, notes in Microsoft and the Roadkill Ahead something not yet widely discussed from Microsoft's announcement of Windows Live: there's an API inside. Since it was Microsoft who pioneered making platforms-into-businesses, this is no surprise. Little detail forthcoming as of yet, but probably not for long. In the meantime they've spruced-up the Microsoft Gadgets site and Gallery.
Part of the PR included this profile of a real estate application, RE3W (Real Estate on the World Wide Web), built using .NET and Virtual Earth.