I'm going to give a crappy answer (no code samples) but hopefully it gets you to start looking in the right direction -- you'll need to use Reflection to load up those classes dynamically and then work with them.  If you have them all inheriting from a base class you can use reflection to load them and then cast them to the base class and call the methods (if the base class were abstract, for example).

Doing a simple Google search for .NET Reflection gave a few results that may or may not be good:

http://msdn2.microsoft.com/en-us/library/ms227224(VS.80).aspx

http://my.execpc.com/~gopalan/dotnet/reflection.html

Reflection is not easy the first time ;)

It can work like this (this is just one of many possible ways):

Dim typeName = "Q12008"
Dim t As Type = Type.GetTypeFromProgID(typeName)
Dim x As Object = Activator.CreateInstance(t)
Dim flags As BindingFlags = BindingFlags.IgnoreCase Or BindingFlags.Instance Or BindingFlags.InvokeMethod Or BindingFlags.Public
Dim myParam As Object = "hello world"
Dim arguments As Object() = {myParam}
Dim pm As ParameterModifier() = {New ParameterModifier(1)}
pm(0)(0) = False ' false for input param, true for output param
t.InvokeMember("DoThisProcedure", flags, Nothing, x, arguments, pm, Nothing, Nothing)

See .. its simple ;) 

JK