Even though there was no tax, the portion in excess of the annual exclusion is "taxable" - the exclusion was applied to it to prevent actual tax from being owed. She does not get another $1MM exemption from gift tax - only from estate tax. If she gave you the $1MM in 2002, any additional gifts that exceed the annual exclusion amount will be taxable AND will have actual gift tax owed.
Based on the facts presented, a $1,000,000 gift in excess of the annual exclusion in 2006 would incur gift tax of approximately $435,000.
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