Google employee Matt Cutts gave a lengthy interview in which he discussed some things that will help webmasters better optimize their websites.
1. The more relevant links you have, the more pages Google will index.
The amount of relevant links your site has directly affects your PageRank. The better your page rank, the more pages Google will index from your site.
2. Slow servers will cause indexing problems
If your site is on a slow server, Google will cap how many pages it will fetch from that server. To counteract this, get a dedicated server or virtual private server for your site.
3. Duplicate content issues
Google will automatically discard duplicate content from your site. Also PageRank can be messed up if you link to duplicate pages. If you are using a rel=canonical tag on your site for duplicate content, Google has no problem
4. Affiliate pages don’t get high rankings
If Google detects that a link is from an affiliate site, then the link will not help your PageRank.
5. 301 redirects don’t have the same PageRank power
When you use redirects from old pages, only some of the PageRank is transferred from that link. 301 redirects does not pass on the full PageRank.
6. Low quality pages get low quality results
Actual products with lots of text are more helpful than little content. Google will either crawl less of the pages on your site, or stop crawling it altogether.
7. Navigation over PageRank sculpting
Google doesn’t like you sculpting your site for PageRank. Matt says that good site architecture and navigation is a better approach.
““Site architecture, how you make links and structure appear on a page in a way to get the most people to the products that you want them to see, is really a better way to approach it then trying to do individual sculpting of PageRank on links.”
“You can distribute that PageRank very carefully between related products, and use related links straight to your product pages rather than into your navigation. I think there are ways to do that without necessarily going towards trying to sculpt PageRank.”
9. Don’t use paid links
Google doesn’t want advertisements to affect search engine ranking. Matt Cutts said that Google “does a lot of stuff” to try to detect ads and make sure that they don’t unduly affect search engines.
Here is the original interview: