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Having the redirects in place should not harm you in any way unless you are chaining them, just watch this Matt Cutts video about the limits on redirects. Regards, Chris Wilson

I don't think you'll see any quick or significant impact linking from your long-tail ranking pages to your individual product (the beauty of the long tail is that you don't need to be so competitive in order to rank) so there's not so much That's not to say that you shouldn't do it but think about what's best for the visitor. Consider where the visitor is in the buying cycle and provide content that supports them at the stage/awareness they're at. Do they know what the solution to their problem or need is? Do they understand the benefits of your offerings. Why should they buy from you. Make sure each of your pages offer an obvious next step. This can be finding out more about your products or is can be a link to buy a particular recommended product. Don't forget your category pages either. Make sure they have some great unique content too - as well as making it easy for people to find what they're looking for. Retargeting is a great idea from Christopher, but I'd also say remember the other downloadable assets like buyers guides case-studies, product data sheets (not just the manufacturers produced stuff) - make sure that any such assets are clearly branded, have your website address and active links back to your site. Again, a lot depends on the kind of products you're selling.