i like the rel=canonical tag and i've seen matt cutts posts on google about this tag. for the site i'm working on, it's a great workaround because we often have two identical or nearly identical versions of pages: 1 for patients, 1 for doctors.
the problem is this: the way our content management system is set up, certain pages are linked up in a number of places and when we publish, two different versions of the page are created, but same content. because they are both being made from the same content templates, if i put in the rel=canonical tag, both pages get it. so, if i have:
http://www.myhospital.com/patient-condition.asp and http://www.myhospital.com/professional-condition.asp and they are both produced from the same template, and have the same content, and i'm trying to point search at http://www.myhospital.com/patient-condition.asp, but that tag appears on both pages
similarly, we have various forms and we like to know where people are coming from on the site to use those forms. to the bots, it looks like there's 600 versions of particular pages, so again, rel=canonical is great. however, because it's actually all the same page, just a link with a variable tacked on (http://www.myhospital.com/makeanappointment.asp?id=211) the rel=canonical tag will appear on "all" of them.
any insight is most appreciated!
thanks! brett