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I am looking to expand the products I offer. Something that is complimentary, but not related to the original product.
Will creating a "mini-site" around the new product hurt the general theme of the site as a whole, or are these the types of doorway content pages we want to always create?
I am curently ranked #3, #1, and #1 for some popular keywords having to do with what I sell.
I suggest subdomains. Subdomains are considered separate from your main domain so it won't hurt your theme - I don't think any SE really looks at a site's theme anyways. You can create a new subdomain for each new product. Just need to be careful about crosslinking.
Anyways a one page subdomain... I don't see a problem with it as long as you don't have too many of them. I think it would be better because you can focus on getting links to the subdomain with the new keyword in the anchor text, and still focus on your 3 main keywords for the anchor text in the links pointing to the root domain. This keeps your incoming links relevent which looks good to visitors and SE's. Visitors following a link to your site from another site with "new product" in the anchor text are going to find "new product" on your subdomain, whereas if that link were pointing to the index in your root directory, they would have to click to find the info about "new product".