We would like to thank comScore, Hitwise, and Nielsen Online for contributing volumes of data to the book. Others who contributed their time or support to our efforts include:
| Hamlet Batista—enterprise search and review |
| Seth Besmertnik—enterprise search |
| John Biundo—local search and review |
| Matthias Blume—metrics |
| Dan Boberg—enterprise search |
| Jessica Bowman—in-house |
| Christoph Cemper—tools access |
| Matt Cutts—review |
| Geraldine DeRuiter—outline development and editing |
| Mona Elesseily—review |
| Michael Geneles—metrics, tools, and review |
| Chase Granberry—tools access |
| Jon Henshaw—tools access |
| Dixon Jones—tools access |
| Brian Klais—metrics |
| Brent Chaters—review |
| Mona Elesseily—review |
| Jill Kocher—review |
| Cindy Krum—mobile search |
| Russ Mann—enterprise search |
| John Marshall—training access |
| Michael Martin—mobile search |
| David Mihm—local search |
| Mark Nunney—tools access |
| Jeremy Schoemaker—tools access |
| Julia Schoenegger—tools access |
| SEOmoz staff—PRO guides access |
| Arina Sinzhanskaya—tools access |
| Chris Smith—local/mobile search |
| Danny Sullivan—for his role in launching this industry |
| Dana Todd—witty wisdom |
| Vryniotis Vasilis—tools access |
| Aaron Wall—tools/training access |
| David Warmuz—tools access |
| Rob Wheeler—tools access |
| Ben Wills—tools access |
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