Just been watching Matt Cutts latest video post on links to non-canonical urls. Its an interesting watch – which doesnt really do anything bar confirm previously considered opinion as to canonical tags order in the ‘food chain’
In the video, Matt highlights that Google do indeed do a ‘very good job’ of dealing with canonicalised URL’s however this is a process undertaken by Google and thus there is the potential for things to be lost in translation. As such, site architecture considerations at source or the implementation of 301′s should be considered as more favourable options according to Matt.
There is no doubting that canonical’s have a use within a search engine optimisation professionals framework – however its always interesting seeing what the search engines recommend when faced with these issues.