A List Aparts' 2007 Web Design Survey.
In April 2007, A List Apart conducted a survey of people who make websites. Close to 33,000 web professionals answered the survey’s 37 questions, providing a treasure trove of data on the business of web design and development as practiced in the U.S. and worldwide.
If you are a web designer, hire web designers, or engage web development firms, this is a fantastic business resource.
Source: This tip loosely inspired by great feedback we're receiving from a number of clients who are currently taking "Making the Move from Print to Web" — a six week class taught by Curt Collinsworth at Seattle's School of Visual Concepts.