Silverlight 3 recently had a documentation refresh to fix bugs, but what I noticed first was that an offline documentation collection was being kept in sync with the changes to the MSDN documentation. I like having an offline copy of the documentation because of the speed and responsiveness when browsing through the documentation locally.

Here's the documentation collection for Silverlight 3 compiled into a help file if you also like having access to documentation offline.

from:Nicholas Allen's Indigo Blog