I'm currently building a webshop based on magento which has a lot of great functionality built-in for this layered/faceted navigation. I've been strugeling to figure out the best way to limit those extra urls, since using those functions easily pushes, essentially the some content, to 20-30 different urls.
I used to think nofollow would be an easy fix, with one shortcomming in the event the some one from the outside linked to one of these urls anyway. But with nofollow being confirmed as a technique that still dilutes link equity, I don't really consider that useable anymore.
Is the canonical tag any good in this case? I mean in essence its the same content, but its not ordered or presented in the same way...
