Anybody have an example of how to use tlbimp.exe's /keycontainer command line switch? 
The googles...they don't help.  It's always /publickey, or /keyfile.  No example of using /keycontainer.  
Anybody have an example of how to use tlbimp.exe's /keycontainer command line switch? 
The googles...they don't help.  It's always /publickey, or /keyfile.  No example of using /keycontainer.  
Well, to answer my own question for the sake of anyone else who may find themselves in this situation:
First, you need to put your public/private key into a 'container'. sn.exe can do this for you:
sn.exe -i MySpecial.pfx MagicContainerName
Then you can use tlbimp.exe like so:
tlbimp.exe MyActiveX.dll /out:MyActiveX.Interop.dll /keycontainer:MagicContainerName
Finally, cleanup the container you created:
sn.exe -d MagicContainerName