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The solutions can be a bit site-dependent, but rel=prev/next is Google's approved choice for paginated content.  It does depend a bit on how complicated your searches are (are there also sorts, filters, etc. that create unique URLs?) and how many pages you're talking about. An older option some SEOs still prefer is to META NOINDEX, FOLLOW pages 2+ of results. Adam Audette has some good resources on the subject: http://searchengineland.com/five-step-strategy-for-solving-seo-pagination-problems-95494 For products, it's a bit trickier. If you're talking about hundreds of variations, and they're very, very similar, then I think rel=canonical can be a good choice. Post-Panda, the risks of indexing hundreds of similar pages are worse than the benefits of potentially ranking for a few product variations. There's no one "right" answer, though - it's always a trade-off. In most cases, I think focuses your ranking power on your core, unique products is usually a good idea.