What is the Assembly Information File for in C# and how do I use it?
The AssemblyInfo file is used to document your dlls or exes to describe where the code comes from, its version etc. If your code is publicly available then its certainly good practice to make sure you add useful information too it. http://www.codinghorror.com/blog/archives/000141.html
If you build your project with NAnt there is also a useful target that allows you to build the assembly info dynamically. http://nant.sourceforge.net/release/latest/help/tasks/asminfo.html