indyank - 3:09 pm on Jan 23, 2013 (gmt 0)
I don't know about others, but Amazon does it perfectly. They do manage to get the right URLs indexed, irrespective of what a human visitor sees or clicks thro. (which is never the same as what the search engines index). I am not arguing that they are doing it right or wrong, but they are definitely in control of everything. So IMHO a study of how they are doing it will throw a lot of insights.