Find the most recently modified table constraints

USE somedatabasename
GO

SELECT DISTINCT CONSTRAINT_NAME

                                 ,modify_date
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
LEFT OUTER JOIN sys.all_objects
ON CONSTRAINT_NAME = name
WHERE TABLE_CATALOG = N'somedatabasename'
ORDER BY modify_date DESC

--complements to Igor Malkiman of Qwest Communications for this code