Canonical Tag

[poolguy]

Does it do anything to place the Canonical tag on the unique page itself?  I thought this was only to be used on the offending pages that are the copies.

Thanks

[AdamThompson]

It is only really required on the non-canonical urls, but it's often placed on the canonical page also. It doesn't have to be, though.

[Theo-NL]

Pages that should contain the canonical tag aren't nescessarily 'offending' anything. They are just pages containing the same information as another page, where usually the only difference is a (non-significant) URL parameter.