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I run several ecommerce websites, and there is some overlap in the products offered between sites.  To solve this duplicate content issue, I use a cross-domain rel canonical so that there is only 1 authoritative page per product, even if it is sold on multiple sites. However, I am noticing that my inbound link profile is massively expanding because Google sees these as inbound links.  The top linking domains for my site are all owned by me, even though there are not any actual links between the sites. Has anyone else experienced this?

My company has developed a detailed white paper/buyers guide for a specific type of widget that we sell, and we're looking for creative ways to market this content.  We will be marketing it on our blog, plus via our ecommerce store's navigation.  Any other suggestions?

At the linklove conference, many of the speakers emphasized the importance of not having too high a percentage of anchor text for your incoming links, because it looks unnatural.  I was wondering whether this applies to your keyword being in the anchor text along with other things, or just exact anchor text matches? For example, if my keyword is widgets, is it bad to have too many of these: Please buy widgets from Acme Corp. or Please buy Acme Corp widgets.

I'm looking to do some competitive research on the top ranking sites in my niche.  How can I get a list of the number of backlinks that come from distinct C-Class IP addresses?  I don't see this anywhere in the OSE data.  Thanks.