Ted Neward shows how the J# implementation of Serializable is compatible with the jdk 1.1 implementation. It’s not compatible with 1.3 or 1.4, but that migh come at a later time. Cool.
He mentions it even means that .NET can tap into EJB containers. Some might find that a bit scary, but it works the other way around. Java is able to tap into .NET objects and services too.