The two major business plan software programs, Business Plan Pro from PaloAlto Software and BizPlanBuilder from JIAN, offer information on projections and other financial forecasting at their Web sites.
Nolo.com provides a wide selection of articles and information about business plans, including information on projections. Go to the Web site and enter "business plan projections" in the search box at the top of the page.
The U.S. Small Business Administration (SBA) provides helpful information about business plans and projections at the Starting A Business section.