An early (prerelease) article about Click Once. It's actually a good article with great source code examples so you can understand the various options for ClickOnce including automatic updates.
A quick write up on how to do code signing so that you get BOTH strong naming for GAC installation, AND Code-Signing for author "trust" validation ... Notice that you have to do Code-Signing in a separate post-build step.
"NetSparkle is an easy-to-use software update framework for .NET developers on Windows, MAC or Linux. It was inspired by the Sparkle (http://bit.ly/HWyJd) project for Cocoa developers and the WinSparkle (http://bit.ly/cj5kP5) project (a Win32 port)."