- ETARGET
- Central European company specializing in pay-per-click targeted online media advertising.
- Google AdSense
- Advertising service allows website owners to earn money as visitors click on the ad links provided.
- Google AdWords
- Pay-per-click advertising service from the major search engine company. Site provides information on the pricing and schemes.
- LookSmart AdCenter
- Online advertising alternative that features an extensive distribution network. Also offers accessible customer support to all advertisers.
- Pay Per Click Guide
- Provides reviews of PPC engines and programs on the web including insights on online advertising.
- Pay Per Click List
- Guide to pay per click marketing and search engines, with a collection of frequently asked questions and articles.
- Pay-Per-Click Analyst
- Provides Pay Per Click Search Engines (PPCSE) reviews, articles, and PPC management tools.
- PayPerClickGuru
- Directory of top pay-per-click search engines with descriptions, user ratings, and sign up links.
- PPCManagement.com
- Marketing firm in New Jersey dedicated to PPC management and Google ad-words management.
- PPCWire.com
- Pay-per-click resource site featuring PPC search engine reviews, news, articles, tips, tools, and links.
- SeoBook's PPC Tools
- List of paid and free pay per click marketing optimization tools. Includes free tutorial videos.
- UserCash.com
- URL forwarding for cash. Monetizes the links that website users post.
- ValueClick
- Provides Internet advertising solutions for online advertisers and website publishers.
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