Simon Guest posts his "Top Ten Tips for Web Services Interoperability" - preach on brother.

• Watch out for Empty Arrays
• Use Package and Type Name Options when Generating Client Proxies
• Testing Generated Java Beans for Null
• Null Dates and Times are recognized by Java, but not by .NET
• Always use compareTo() when comparing dates/times
• Use Trace Tool to Investigate
• Add Option to Change Host and Port
• Ensure Document/Literal when generating Web Services
• Use Unit Tests to Test Interoperability
• Use XSD First