This problem has been resolved in Q3 2009 release. The handler registration should look like this:
<add path="Telerik.ReportViewer.axd" verb="*" type="Telerik.ReportViewer.WebForms.HttpHandler, Telerik.ReportViewer.WebForms"/>
and the viewer registration on the page:
<%@ Register TagPrefix="telerik" Assembly="Telerik.ReportViewer.WebForms" Namespace="Telerik.ReportViewer.WebForms" %>
This would work only in case you have a single version of the reporting assemblies in bin.
All the best,
the Telerik team
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