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For many sites the little green dropdown arrow in serps only has a link to 'cache' but in many there is also a link, or only a link, to a 'similar' option.Similar sites can also be listed by performing the following search on Google:
It has always seemed to me that it's random, although within industry/category
Could you be more detailed about this particular
A site, I looked at, referred to under related:widget.com , had some links shown in the results, with "no-follow" in the code of the referring site. Google seems to have ignored the do follow, in attributing a relationship to the originating site. Hope that makes sense.
I do know that none of the first 50 similar sites link to mine according to GWT