http://wesnerm.blogs.com/net_undocumented/2004/09/avalon_throwawa.htmlMiguel de Icaza of Novell is the lead of the Mono project, which is an open source implementation of the .NET framework based on the ECMA standards. Today, Miguel blogged his thoughts about the Longhorn changes and brought up several issues he has with Avalon. Chris Anderson, and architect on the Avalon team at Microsoft wrote a response addressing several misconceptions and agreeing on some of the points. It's a very interesting read.
Update: Wesner Moise posted some more interesting thoughts on the topics.