There's lots of .NET-and-Java interop stuff happening at JavaOne this year.   I'll be participating in a panel discussion, as well as a BoF session.  A number of other Microsofties will be doing sessions.  And, we have a booth on the show floor.  Come and visit!   Find more about the interop track here:  http://java.sun.com/javaone/sf/interoperability.jsp