> What formats will MM.Net export to (e.g. XLS, PDF, txt, rtf, ...) ?

This does not sound like a problem which MM.NET is designed to solve. By the sounds of things, you're looking for a reporting engine.

A couple of suggestions: http://www.devexpress.com/Products/NET/WinForms/XtraReports/ or
http://www.gotreportviewer.com/, but there are heaps more (ActiveReports, Crystal, several open source projects as well).

An application built using MM.NET can do anything that standard .NET can do. The MM.NET data access layer can return information in standard DataSets or DataReaders. If you just want data export, exporting to CSV, DBF etc is not too strenuous.

I won't try and go into the ins and outs because I suspect you're fishing and just need a few pointers at this stage. And I don't know everything <g>