WCF REST Configuration for ASP.NET AJAX and plain REST Services - Rick

WCF REST services however provide features that ASMX does not, such as the ability to serve raw non-ASP.NET AJAX formatted data in 'bare' format. If you're working with non-ASP.NET AJAX clients like jQuery or Prototype this can be a bonus and lets you avoid using the MS AJax client libraries and ScriptManager. WCF REST also supports raw XML based access to services which is also useful and can't be directly accomplished with ASMX.