I have created a new article that shows a whole example of an add-in creating a command and a button with a custom picture using a satellite managed (.NET) dll:

HOWTO: Create a command with a custom picture using a managed satellite DLL for a XML-based Visual Studio add-in.
http://www.mztools.com/articles/2012/MZ2012002.aspx

While I had the article HOWTO: Creating custom pictures for Visual Studio .NET add-ins commands, buttons and toolwindows, it was not supplying a whole example of a working add-in. The next version of my MZ-Tools add-in will switch from being a COM-based add-in with a native satellite dll to a XML-based add-in with a managed (.NET) satellite dll, and I have found quite a few issues until it worked fine. One of them was that I wanted a single satellite dll, not one dll for each culture (“en-US”, “es-ES”, etc.) and finally I found a nice trick to accomplish that, using the AppDomain.AssemblyResolve event.

If you have followed my blog last years, you know how much I hate satellite dlls so after 4 years I finally got Microsoft to get rid of them in Visual Studio 2010 (bad luck if you want to support Visual Studio 2005 and 2008. Update: it happens that the approach also works in VS 2008). My next article will show a whole example.