My collegue Cédric Rup tells me that jQuery, an open-source Javascript library, is to be included in a future version of ASP.NET and Visual Studio. A surprising move, as jQuery was still a minor player only a few months ago — also, Microsoft would not have been expected to be so open-source-friendly (jQuery is available under both MIT and GPL licenses; given MS’s well-known hostility to GPL, it is clear that the MIT license is what made it palatable to them ).
Another colleague, Matthieu Guyonnet-Duluc, adds that this is probably due to the influence of Scott Guthrie, architect of ASP.NET and the one behind ASP.NET MVC and the push to publishing the source code of the framework.