Hi Philsturgeon
Assuming you have a main page "A0" and several canonical versions "A1" to "An", where A0 does not use a robots meta tag, while A1-An use a noindex robots meta tag and all pages use the rel=canonical link element: In this case, the noindex robots meta tag on A1-An would generally not affect the indexing of A0. However, if we were to discover one of the pages A1 to An first, we would not index the content until we have also found A0 (because A1-An have the noindex robots meta tag).

Davidfree, I agree, if you can avoid it at all, it's always better to make sure that your site doesn't have duplicate content and that you only have your content on a single URL :-).

Cheers
John