Update: As further evidence to the notion that the DecisionMakingExecs@MSFT have seemingly confused April 1st with yours and my birthday, Miguel de Icaza recently chimed in on Twitter to a query of mine regarding this announcements authenticity:

@mdavid according to download.microsoft.com it is MS-PL, I just got my own copy and verified.

[Original Post]
While my Lambda Expression is obviously a joke, regardless of today's date, what it attempts to represent is no laughing matter: ASP.NET MVC 1.0 has moved from "source available" to an officially OSI blessed OSS license, the MS-PL. As the sixth "Scott" hit on Google (Scott Hanselman) recently points out, the fourth "Scott" hit on Google (Scott Guthrie) recently posted the following bit of news to his blog:

Releasing the ASP.NET MVC source code under MS-PL

I'm excited today to announce that we are also releasing the ASP.NET MVC source code under the Microsoft Public License (MS-PL). MS-PL is an OSI-approved open source license. The MS-PL contains no platform restrictions and provides broad rights to modify and redistribute the source code. You can read the text of the MS-PL at: http://www.opensource.org/licenses/ms-pl.html

*SWEET*! This is /incredible/ news, furthering Microsoft's recently sloganed (<- No, not a word, but should be! ;-)) agenda "Make Web Not War."**

Keep the open web love rolling, MSFT! :-)

** Absolutely /BRILLIANT/ slogan, in my opinion.