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The challenge in SharePoint development has always been the balance between creating and deploying solutions that you can trust not to damage or impair a SharePoint farm. A new feature in SharePoint 2010, called Sandboxed Solutions, enables farm administrators to feel comfortable that the SharePoint farm is safe, gives site collection administrators the authority to manage applications in their site collection, and provides developers with the flexibility to create solutions they know will be deployed in a safe and rapid manner.
MSDN Magazine November 2009
I have created a custom user property,and created metadata property and added mapping to it, still i m not able to Search in People,Please advise