Google, Yahoo!, and MSN are not the only search engines on Earth, nor even the only general-purpose ones. There are many other general-purpose and specialized search engines and some of them can be really helpful for reaching your target audience. You just can't imagine for how many niches specialized search engines exist – from law, to radiostations, to educational one! Some of them are actually huge sites that gather Webwide resources on a particular topic but almost all of them have sections for submitting links to external sites of interest. So, after you find the specialized search engines in your niche, go to their site and submit your URL – this could prove more trafficworthy than striving to get to the top of Google.