Google AdSense combines Google's search technology with thousands of keyword advertisers to deliver targeted text-based ads to search result pages. If people click on these ads, Google pays you.

You can use standard Google search box and search results or you can customize the look and feel of the Google search box to match your site.

With Google search your visitors can search the Web from your website and SiteSearch feature will let them search your own site as well.

The Top Queries report shows you what your users are looking for, by listing the 25 most common searches conducted through your AdSense for search boxes.

You can track the number of queries, clicks, clickthrough rate - as well as your AdSense earnings - via a web-based account which you can easily update at any time.

$100.00 minimum payment. Affiliates are paid monthly, within 30 days of the end of month.
Recommended.

Miva

Monetize Web searches by integrating Pay-Per-Click Ads into search result pages that stay on your site and reflect the look and feel of your brand.

Also you can designate alternate Ads or MIVA run-of-network Ads to monetize obscure searches on your site.

At the end of the month pay balances over $25. You can choose to receive payments check or PayPal.

RevenuePilot

Affiliates receive 60% of what advertisers pay RevenuePilot per each click.

Provides with various linking methods (search box, text link, xml feed etc.). Only pays for traffic coming from the US, UK, Canada and Australia.

It is possible to check online how much a particular keyword is worth across the RevenuePilot Network.

Payments are made NET60 once your balance exceeds $25 dollars.

You can choose to be paid by Check or PayPal at no charge. Wire Transfers are available for a fee.

Search123

Pay-Per-Click (PPC) search engine. Part of the ValueClick.

Implementation kits range from HTML search boxes, search directory pages, contextually targeted text ads, XML feeds and customised search solutions.

Accepts traffic from the US , Canada, UK and several other English-speaking and European countries.

The minimum CPC on Search123 is $0.05.

Publisher Programs are paid 50% of the bid amount.

Minimum payment $50. Payments are made on a Net-30 basis.

SearchFeed

Pay per click search engine that allows you to place search box or dynamically displayed search results on your site and earn 35% - 50% of the profit on the clicks generated.

Easy cutting & pasting of system-generated code lets you choose look and feel. Detailed online reporting included.

Also get paid 5% - 7% commission on every payment a referred advertiser makes, as well as 2% - 5% from referred affiliates earnings.