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WordStream provides Internet marketing software and tools which are designed to make your search marketing campaigns more organized and more profitable.

PPC Hero covers all topics related to pay per click advertising - from Google AdWords to Yahoo! Search Marketing to landing pages to writing headlines.

PPC tools, trainings, and forums that give you access to sophisticated tools at an affordable price.

Quora is a continually improving collection of questions and answers created, edited, and organized by everyone who uses it.

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Acquisio SEARCH lets you manage multiple pay per click (PPC) marketing campaigns, from multiple engines, from one convenient interface. Save time and money with automated PPC reporting and powerful campaign optimization tools!

Unbounce lets marketers build, publish and test landing pages without IT or software. A/B testing and lead gen make it a powerful marketing tool.

Search Engine Land is a must read hub for news and information about search engine marketing, optimization and how search engines such as Google, Yahoo, Microsoft Live.com and Ask.com work for searchers.

A well-rounded view on search engines and search engine marketing from five segments of the Web population represented by senior members of the major SEO/SEM forums on the Internet.

Strategic SEO consulting and search engine marketing services include Search Engine Optimization (SEO), Pay Per Click (PPC) advertising and Website Analytics.

Learn how to create successful Internet marketing campaigns. ClickZ has expert advice about online marketing, email, brand and interactive marketing, and search engine marketing. Read the latest Internet advertising news, e-commerce market research, ...

Stone Temple Consulting offers online marketing services (SEO, SMO, PPC) to a wide range of companies, ranging from Fortune 25 companies to emerging startups.