IDL For VB Tutorial (VB2TheMax, Philip Fucich)

One of the better articles available describing Type Libraries and how they relate to VB. It describes the tools you will need to use, and describes some of the IDL syntax showing how it relates to VB code. Despite the fact that it again describes the simple IDL use-case of creating an interface which you can implement in VB (something which of course you can also do rather more simply by writing the Inteface in VB itself and then compiling it), it goes a bit further and provides some pointers which will be handy if you're trying to convert COM API interfaces for use with VB (or even .NET).