Ajax and Web 2.0 ready
Ajax ready out-of-the-box
Check out the Ajax-powered search in this example site. The libraries are also used with QuickEdit, our front-end editing tool.
Smart integration means the scripts are only included in the document head when needed - no unnecessary bloat on simple pages!
Web 2.0 today
MODx makes child's play of building content managed sites with validating, accessible CSS layouts - so web standards compliance is easy. (You can create a site with excessively nested tables too, if you really want to).