Ryan Linton (a PM on the VS Help Team) has create a neat VS extension that provides a Help Index, Search and the ability to view help topics right inside the VS 2010 IDE.
1. Run VS 2010 and open the extension manager
2. Select "Online Gallery" (left nav) and type "HelpViewer" into the search box (top right). Click Download.
After restarting VS 2010 the Help menu will now contain "Help Viewer Keyword Index".
The options page lets you open help results in the default browser or embedded inside the IDE
Index items are searched for as you type. Double-click an index item and help opens inside the IDE.
Here's a shot without TOC.
Notice the disambiguator results (where an index items has more than one result) are expand in place below the keyword prefixed with a "-" hyphen.
Here's the search tab...
Very nice! Thanks Ryan!
You can report bugs and ask Ryan questions here: