Product links can be shortened to:

    http://www.amazon.com/dp/B005JSZJVS

    (the ID is an ASIN)

Browse node links can be shortened to:

    http://www.amazon.com/s?rh=n:16310091,n:!16310161,n:256346011
    http://www.amazon.com/b?node=256346011

more info

Terminology

• browse node [2] [3] [4]
• search index
• a book about "browse nodes"