Interop grill-off

I think it would be good for us to have some sort of interoperability  
test and event. Putting on my PGP Corporation hat, I'm happy to  
sponsor it. However, it doesn't *have* to be a physical event. Does  
anyone else think it would be a good idea? Does anyone want to help  
put it on, come up with test cases, that sort of thing?
    Jon