Which architecture, engineering and environmental consulting firms are the hottest in the industry right now? The Zweig Letter will answer that question with its 2007 Hot Firm List. The list is based on a survey of industry firms conducted by the Zweig Letter, the voice of reason for architecture, engineering and environmental consulting firms. The Zweig Letter 2007 Hot Firm List is limited to firms based in the United States and Canada that derive the majority of their revenue from the practice of architecture, engineering, planning, environmental consulting or allied disciplines. Firms are ranked according to their three-year growth rate in gross revenue from 2003 to 2006. Design and environmental consulting firms may enter the competition online at http://www.thezweigletter.com/. The deadline to enter is June 1, 2007. The 200 fastest-growing firms will be announced at the eighth annual Hot Firm Conference, held October 24-26, 2007, in Boston. For more information, go to http://www.zweigwhite.com/.