Allows you to buy advertising on the Google search engine, or on other sites through its AdSense program. Includes a tour and FAQ.

Distributes results to a large network of other search engines and search box providers.

Offers advertising through a network of hundreds of distribution partners, including Excite, EarthLink, and MSN.

A pay-for-placement search engine that allows advertisers to bid on keywords. Feeds search results to a large network.

Pay per click search engine with an affiliate program.

Targeted, high-volume website marketing.

Offers a category based search engine and advertising programs.

A pay-per-click search engine that has partnerships with NetZero, DogPile and InfoSpace.

Offers low initial bid prices and no fees.

Search engine mixes natural search, directory listings and ppc listings.