tedster - 5:56 pm on Aug 20, 2010 (gmt 0)
Is it worth putting a canonical tag on every page in case there are alternative paths to a page that you had not considered?
That's exactly why I use the canonical link tag. Here's a key historical thread that catalogs maybe 40 potential canonical errors [webmasterworld.com]. Many websites, especially those with a complex server infrastructure, cannot address them all on the server. A server based fix is still the ideal, but just LOOK at some of those potential canonical problems our members turned up!