Licenses that Microsfot uses (http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx).  I have talked about WIX, WTL and SSCLI.  But hot off the press from OSCON (I have to go next year!) is this (http://radar.oreilly.com/archives/2007/07/microsoft_to_su_1.html)!  If it were not Tim OReilly I would not believe it!!!  This is great news but is a bit confusing.  I was listening to a great IT Conversations Podcast just the other day that posed the question “What is Open Source?”  There are many definitions and licenses.  Is SugarCRM Open Source?  Pentaho?  MySQL?  PostgreSQL?  Interesting.