7. Acquisio

Acquisio SEARCH is a white-label productivity platform designed specifically for SEM agencies. Here are some advantages of using this service:

• It creates campaigns across all search engines from one interface.
• It has keyword recommendation tools and campaign creation wizards.
• It has a cross-engine bulk editing tool (similar to AdWords Editor) for the Big Three search engines: MSN, Yahoo! and Google.
• Its reports, charts and graphs are customizable, with a section to add specific comments.
• Pricing is scaled for various sized companies.

Disclosure: Acquisio is an advertiser in Web Digest For Marketers.