Split JavaScript to modules for amd.
More module steps here. Add some magic to Jake files.
HTML5: Finally got FileInput working on this branch. Yeah...
HTML5: Do not initialize the runtime, if browser doesn't have window.File.
XHR: Consistently resolve url.
Modularize HTML4, Flash and SilverLight runtimes.
Split ImageInfo.
Flash: Conditionally compile in image manipulation logic or not, depending on command-line arguments.
Flash: Actually conditional logic can be simpler.
Build: Split BuildTools. Add a Task for xap generation. Update readme.
Silverlight: Always build fresh.
Correct minor typos in readme file.
Build: Fix mkjs Task.
Build: Add bootstrap file.
Build: Make sure that Silverlight components can indeed be built on Windows.
Update README.md
Flash/HTML5, Image: Do center-oriented cropping. Flash, Image: Fix bug, when tall and very wide images failed to resize correctly.
Silverlight, Image: Do center-oriented cropping.
Silverlight: Do not track *.sln and *.suo files.
Silverlight, XHR: Enable buffering, since HttpWebRequest.AllowWriteStreamBuffering = false causes silent crash on Mac OS X 10.8.x.

And in general is said to be problematic, for example:
http://goo.gl/H1C71