American Regions Mathematics League - Yearly math competition held simultaneously at Pennsylvania, Iowa, and Las Vegas the first Saturday after Memorial Day, with sample problems and links to pages of ARML teams. www.armlmath.org
Colorado Mathematical Olympiad - Includes introduction to Olympiad, old problems, pages on winners, speakers and judges from 1999 and 2000. www.uccs.edu/~asoifer/olympiad.html
Highland Park Math Team - The official website of the Highland Park Math Team of Saint Paul, Minnesota. math.mitcho.com
Problem Writing For Mathematics Competitions - High quality mathematics problems for middle school and high school math competitions. Topics range from algebra and geometry to probability and trigonometry. Pricing is available upon request. www.virtu-software.com/math/default.asp