From Feb/2006

In a survey of 488 developers using Ajax professionally, the Burton Group found
 
• Prototype proved the most popular with 26.6 percent.
• Script.aculo.us owns about 19.5 percent of the market;
• DWR, 14.8 percent;
• Dojo, 11.1 percent.
• The remainder came in at 10 percent or less.