Sameer Bhangar the Test Lead on ClickOnce project recently internally sent out a list of the top ways to learn about ClickOnce. Is by no way the authoratative or complete list but definately good starting point. This should serve as a good resource for anyone ramping up on ClickOnce. Feel free to recommend other resources and I'll add them in here.
Top X ways to learn about ClickOnce -
ClickOnce Discussion Forums: External forum - http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=6 - As I as have mentioned earlier in my blogs, the forum is the ideal site to go to with ClickOnce issues, bugs, feature request and even general discussion on App Model/Deployment. It is looked at regularly by the ClickOnce product team who do a great of following up on the posts.
Microsoft sites: Smart Client Dev Center Home: http://msdn.microsoft.com/smartclient/understanding/windowsforms/2.0/features/clickonce.aspx MSDN content on ClickOnce - http://msdn2.microsoft.com/en-us/library/wh45kb66(en-us,vs.80).aspx. Video of Jamie Cool the PM on the Winforms/ClickOnce team demoing ClickOnce - http://channel9.msdn.com/ShowPost.aspx?PostID=15303 Article by Brian Noyes on configuring trust with ClickOnce - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwinforms/html/clickoncetrustpub.asp Article on ClickOnce and Regfree COM - http://msdn.microsoft.com/msdnmag/issues/05/04/RegFreeCOM/default.aspx
Overview article by Brian Noyes - http://msdn.microsoft.com/msdnmag/issues/04/05/ClickOnce/ - Bit old so some specifics may have changed but overall is accurate Non-Microsoft sites: ClickOnce Publisher Certificates - http://geekswithblogs.net/kobush/archive/2005/05/30/41068.aspx Links to various ClickOnce related material - http://www.installsite.org/pages/en/clickonce.htm. VS Support for ClickOnce - http://www.ondotnet.com/pub/a/dotnet/2004/10/11/clickonce.html Another VS walkthrough - http://www.15seconds.com/issue/041229.htm
Few Blog references to ClickOnce: Saurabh's blog - http://blogs.msdn.com/saurabh/ - The one stop Authoratative ClickOnce Resource (well Sammer's mail didn't say so but it should have :-) ) http://mtaulty.com/blog/(5re21u3e1v3wjmm1qhgybqfo)/archive/2004/07/05/524.aspx http://mtaulty.com/blog/(32qtav45kx5a5zeb2taste3j)/archive/2004/07/06/525.aspx