Microsoft's Betrand Le Roy just put together a great post on how to document JavaScript code in VS.NET Orcas.  By adding documentation comments, users of your script will get nice intellisense as they type and use JavaScript classes, methods, etc.  Nice stuff that we've all wanted for a long, long time.

http://weblogs.asp.net/bleroy/archive/2007/04/23/the-format-for-javascript-doc-comments.aspx

Wally McClure just released a video that shows what the new intellisense support looks like as well.

Read More here: JavaScript Intellisense and Documentation in VS.NET Orcas