This is a pretty cool webcast, where I'll show you a little class library that I threw together to aid in adding ClickOnce features to your application.  Here is the source code.  In that zip file, you'll find a project that contains a few classes, there's a class for an UpdateLink control, one for a VersionLabel control and finally, the control called the "TaskBarNotifier" which includes a little Toast (blatently taken from John O'Byrne's CodeProject article - to notify the user when a new update is avilable, and the current staus of deployment.  Very cool stuff, check it out.

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(Man... that's a heck of a url!)