I would like to nominate this to the necro post of the year! 
www.b4x.com
How to create a Basic4ppc library
Creating libraries is pretty easy. It can be done using C# or VB .Net and using Visual Studio 2003 or 2005 (professional version). You should create a .Net CF class library. The library should include at least one public constructor (which will be converted to New1, New2...). You could use...