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Recently,  Marrie has written nice post in youmoz blog. Here is the URL :

http://www.seomoz.org/ugc/are-seos-destroying-small-businesses-a-penguin-story

Hope this will help....

Can't you show message "Product is out of stock for now" message. And show related product below with "You might be interested in below product"  message.

There are various plugin available in Joomla for URL Canonicalization. You can try below plugin :

http://extensions.joomla.org/extensions/site-management/seo-a-metadata/url-canonicalization-/16432

In your case you have to put canonical tag on "affilaite landing page". For Example :

Landing Page : www.example.com

Landing Page for Affiliate : www.example.com/?aff_id=10

Both the pages has the same content so to come out of this you have to put below tag in affiliate landing page

rel="canonical" href="www.example.com" />

Other Solution: You can block these affiliate pages in robots.txt or by putting noindex,nofollow meta in "landing page for affiliate.

May I have your URL pls ?

For Example: You have two version of home page (1) http version (2) https then in that case you have implement Canonical on home page. Many big sites who does financial transaction use the same approach.

Hi,

I have good links for you. Few days ago John Doherty has written two nice blog post on it.

http://www.seomoz.org/blog/smarter-internal-linking-whiteboard-friday

http://www.seomoz.org/blog/internal-linking-strategies-for-2012-and-beyond

Hope below links help...