The port of Report Manager engine to C#, mono and dot net is in beta stage,
but already working (Linux and Windows).

http://reportman.sourceforge.net/doc/dotnetport.html

http://reportman.sourceforge.net

Basically you can design and tests your reports, using the report designer
(Windows and Linux), selecting the dot net provider data connection, then
you can execute your reports using the library in your applications.

Export to pdf is working so it's useful for web applications, for desktop
applications, preview and print is available, note that native Report
Manager preview is much faster and flexible, but you can use dot net
framework preview if you want.

There is a group in yahoo groups (reportman) to discuss, post bugs etc...

Thanks

2.0: Nested configuration data
resource leak issues in win xp sp2 w .net 2.0
checksignature always returning false
Component constructor in .NET 2.0
win32 in memory drawing