Links are widely considered to be one of the, if not the most important ranking element. Getting the right links is hugely important. But also the links within your site play a big role. It is an indication
Pageranksculpting is a way of making sure your internal structure is in order. But the question is: is this important? Matt Cutts answered a question about this: “If we add more than one links from page A to page B, do we pass more PageRank juice and additional anchor text info? Also can you tell us if links from A to A count?”. The important part in this video is to watch Matt Cutts’ fingers. And in the first part he is quite open for his standards.