Meant for Web 2.0 Apps that use a lot of JavaScript, Doloto will speed up the download time of all the JavaScript by basically removing anything that isn't initially needed and replacing it with stubs. It will then download in the background or wait until it is first called. The result, a seemingly much faster Web App for the user.

For more info have a look at the Doloto page on Microsoft's Research site or head over to the download page on MSDN.