When it comes to search engine optimization one needs to have backlinks and for this you need a link wheel. What I mean by this is demonstrated in the following diagram.
Imagine owning a few of these horse racing domains and link them to your main website. This is how link wheels work, you then attach blogs, ezine articles and classified ads you get yourself a circle of links, interlinked with your niche website.
Be careful who you link to. Its alway a good idea to get feedback from our SEO experts as to avoid being penalized by a search engine afterall you want to be be ranked as high as possible and even rank no1 on the first page so avoiding costly mistakes such as linking your websites to deceptive or misleading content such as doorway pages or "throwaway" domains, meaning a registered Internet domain names that are used to temporarily test a new piece of software application or for spamming purposes. The domain may last for only an hour and never be used again, your site could be removed entirely from Google's index if that was the case, that you linked yourself to such a domain.
Also something else to watch out for is redirected domains which one day could point to a legitimate site and the next day to an entirely misleading one.