[Interop] The interop page to visit

In case you haven't seen it, this page at MSDN contains lots of good articles and resources around Web Services Interoperability.

One article that looks quite useful for me is one written by Simon Guest -> WS-Security Interoperability Using WSE 2.0 and Sun JWSDP 1.4. Actually, Simon has done lots of good stuff around Web Services, see the MSDN webcast about Web Services Interoperability tips.