Class Libraries a suggestion:
myBase.vcx - Microsoft’s base classes. Very little functionality added.
myCtrl.vcx – controls (subclassed from myBase.vcx) with added functionality, eg. bound textbox, date textbox, bound editbox, navigational buttons etc.
myForm.vcx – Forms with added functionality. Sub-classed from myBase.myForm or forms within this class library. For example read-only form, data-entry form, logon form, splash screen etc.
myLib.vcx – Composite classes and controls with specific functionality, eg. Textbox with incremental search etc.

These class libraries are only used to create (sub-class) application libraries.

Every application contains its own set of libraries sub-classed from the above. For example every project will have as a minimum aaBase.vcx, aaCtrl.vcx, aaForm.vcx, aaLib.vcx where "aa" identifies the project. In addition there will be other libraries required by the application.

That’s my approach, hope it helps.