Is there a tutotial or help file, suitable for a beginner c# programmer to use.
(Edit: I didn't read the subject line, so this is about C# in general, not about Farseer Physics.)
I collected some links a few years ago, when I was giving a programming course that used C#. They may or may not be very up to date when it comes to later developments in C#.
There is the "C# Station Tutorial" (http://www.csharp-station.com/Tutorial.aspx).
If you know C++ and are switching to C#, you could try "C++ -> C#: What You Need to Know to Move from C++ to C#" at MSDN (http://msdn.microsoft.com/sv-se/magazine/cc301520(en-us).aspx).
if you know Java, you could try Dare Obasanjo's "A COMPARISON OF MICROSOFT'S C# PROGRAMMING LANGUAGE TO SUN MICROSYSTEMS' JAVA PROGRAMMING LANGUAGE" (http://www.25hoursaday.com/CsharpVsJava.html), or Ben Albahari's "A Comparative Overview of C#" (http://www.genamics.com/developer/csharp_comparative.htm), or "C# for Java Developers" at MSDN (http://msdn.microsoft.com/en-us/library/ms228358.aspx).
Andy Beaulieu has beein doing a lot of work to make Farseer easier to use in Silverlight, you can read about it here:
http://www.andybeaulieu.com/Home/tabid/67/EntryID/115/Default.aspx
The primary documentation for the Farseer Physics engine is on the homepage.
http://www.codeplex.com/FarseerPhysics/Wiki/View.aspx?title=Documentation&referringTitle=Home
You can also check out the source code, they have a demos folder in there, though it's only got one example, but it can show you how to implement the engine
For a last resort, check out their forums, and ask some questions. They seem nice enough that they should be able to help you out with any questions.
I realize this is an old question, but for future searchers I will post a few links:
Farseer Physics Helper
Physics helper for Blend makes it very easy to create realistic looking games or demos using practically no code :)
http://physicshelper.codeplex.com/
Farseer Physics Engine Simple Samples
Very simple and easy to understand samples (compared to the original Farseer ones)