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Fiddler (http://fiddler2.com/fiddler2/) is a great tool to enable request-response tracing for web applications. This tool will help you look at and analyze XML information being exchanged with the HealthVault platform.
Get Real Consulting’s X-Ray for HealthVault (https://xray.getrealconsulting.com/) is an indispensable tool for HealthVault development. It offers the ability to create data in a HealthVault preproduction and production environment and to export and import information.
The HealthVault team hosts Developer Center tools at http://developer.healthvault.com/. This page is very handy for looking at HealthVault method and data type schemas.
HealthVault Application Data Checkup (http://datacheckup.healthvault-ppe.com/hvappcheckup) offers lint functionality for data written by your application. This tool highlights best practices for writing data to HealthVault for a select set of data types.