After reading Tom Kraak's post on the new canonical link tag... and talking to him and Stefan Culmann... I am still convinced that a SkinObject is a good solution in many cases  If you are liek me... - follow the white rabbit...

1. Download file and install it as you would any module.
    
2. Add a reference to it in the skin in the same manner it is done for any other SkinObject - i.e. <%@ Register TagPrefix="vp" TagName="CANONICAL" Src="~/DesktopModules/CanonicalSkinObject/Canonical.ascx" %>
   
   
3. It takes three parameters:
   1. HREF - it doesn't care what you entered, or if you entered anything altogether. So make sure you've entered a full domain name - i.e. http://continure.com...
   2. ExcludeCanonical - True/False (default False) - if set to true, the tag will not be added to the page which url is set to as canonical
   3. ExcludeQueryString - True/False (default False) - if set to true, the tag will exclude any query string that may be in url, so http://continure.com/home.aspx?ctl=login woudl have http://continure.com/home.aspx as canonical href in the tag

Example: <vp:CANONICAL runat="server" id="canon" HREF="http://continure.com" ExcludeCanonical="true" ExcludeQueryString="true" />

NOTE: For HREF parameter you should only add DOMAIN - not the full url. The Skin Object will take care of the rest... For example, for this site we've entered HREF="http://continure.com" - but the net result for this page is <link rel="canonical" href="http://continure.com/downloads.aspx" />

Issues, problems, questions, praises - feel free to contact us!

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Vitaly Kozadayev Principal Viva Portals, L.L.C.