I'm surprised how many people don't realize that we (and by we I mean VB) have full generic support in Whidbey. We can consume, author, and use constraints. I just answered an internal email where someone was wondering how this all worked and I figured this info would be useful to all you Channel9 types.
Imports System.Collections.Generic

Dim foo as New List(Of String)
Dim bar as New Dictionary(Of String, String)

Module Test
   Public Sub Foo(Of T)(ByVal param As T)
   End Sub

   Public Sub Bar()
      Dim x as String
      ' call explictly the one you want
      Foo(Of String)(x)
      ' or let the compiler do it for you
      Foo(x) ' same as above
   End Sub

End Module

Public Class Foo(Of G,E,N,E,R,I,C,S)
End Class


Public Class Foo(Of T As IEnumerable)
End Class

Happy Coding (especially if it's in VB Smiley)