Mix 07, the Microsoft sponsored web developers conference in Las Vegas begins with registration tonight and the Ray Ozzie/Scott Guthrie keynote set for 9:30 PDT tomorrow (Monday April 30).  So what to expect?  Well lots of news and in depth coverage of a whole new set of APIs (application programming interfaces, a way for programmers to request services from a computer system or program that would otherwise be unavailable to them).  New APIs have been announced for Virtual Earth/Live Maps, and for Spaces, and expect more to come from Live.com, Messenger, and others.

The big non-Windows Live news will of course be around Silverlight, formerly called WPF/e (Windows Presentation Foundation/everywhere), but Windows Live will be featured prominently, as well.

The Ray Ozzie keynote will be webcast live on Monday morning, we'll be watching and have a full report:

Ray Ozzie Keynote at MIX07
April 30, 2007
9:30 a.m. PDT / 12:30 p.m. EDT

In an address from Las Vegas at the MIX07 Web conference, Chief Software Architect Ray Ozzie and Developer division General Manager Scott Guthrie will discuss the full breadth of Microsoft’s developer vision and roadmap for Silverlight, Microsoft’s cross-platform application for delivering the next generation of media experiences.

View Live Webcast:

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In addition, many of the sessions will be webcast as well, you can check out the particulars at http://visitmix.com