I have created a new fyiReporting viewer for Linux using Gtk#. It is currently very basic but will show a report. The code can be retrieved from https://github.com/majorsilence/My-FyiReporting in the RdlGtkViewer project. I have currently tested it with Ubuntu 11.10.
All issues and feature requests can be put through the projects github issues page.
It is simple to use. Add a reference to the RdlGtkViewer assembly in your project and then add the RdlGtkViewer widget to one of your forms.
Lets say I added a new instance called rdlgtkviewer1 to my project. I can load a report with parameters with the following line of code.
this.rdlgtkviewer1.LoadReport( new Uri(@"/home/peter/Projects/My-FyiReporting/Examples/SqliteExamples/SimpleTest3WithParameters.rdl"), "TestParam1=Hello and Goodbye&TestParam2=Testing parameter 2");