While our gut is telling us that only a small percentage of searches are performed with quotes, we don’t know of any published research on this. Your question made us curious…
Gravity is founded on the expertise of its two partners, authors of the acclaimed SEO book "Search Engine Optimization: An Hour A Day" (Wiley, 2006, 2008, 3rd edition upcoming in 2010).
After starting out in industrial and corporate video production, Jennifer Grappone became a web project manager before working exclusively in SEO starting in 2000. Jennifer advocates a holistic approach to SEO, one that combines elements of good writing, usability, search-friendly site design, and link building.
The Left Brain
Gradiva Couzin has been working in SEO since its early days in 1998. With a history as a civil engineer and experience in website and database development, Gradiva excels at the technical side of SEO, and enjoys facilitating communications between techie- and non-techie folks.