Hi Brian,

At work, we created a few seperate solutions containing our utility classes.  The solutions are based on high level categories (i.e. Formatting & Validation, Services, User Controls, etc).  Then within each solution we have the appropriate projects.  Each project contains the appropriate classes and creates it's own dll.  Then in our DNN Modules we just reference the nexessary dll the same way you reference the core Dotnetnuke DLL's.  The naming convention we use for the namespaces is...

For DotNetNuke specific code:

MyCompany.DNN.Utilities.BaseClasses...

For generic ASP.NET code:

MyCompany.ASPNET.Utilities.BaseClasses...

Hope this helps,

Chuck R.