One of the coolest controls that Visual Studio 2005 includes is the report design and view functionality of the ReportViewer controls. What used to be a server-only function, .RDL (now .RDLC) files can be rendered client-side by Web or Windows applications with this control. Reports can contain tabular, aggregated, and multidimensional data.

Thanks to Peter Myers for pointing me to this site to answer all of my (and your) questions and help unlock the hidden potential of the ReportViewer control.