Best way to automatically delete multiple duplicate contacts?

I had Mobile Me go nuts on me a few weeks ago and took my 1,000+ contacts and duplicated them with every sync up to 16,400 before I caught it and shut it down.
This happened to my iCal appointments as well, but there is a simple application out there that allows duplicate entries to be automatically deleted.
Anyone know how to do this with AddressBook? I really don't have time to go through 16,400 entries and confirm each one before deleting them!!

Best is to not get them - how did you end up with duplicates?
A good solution is Duplicate annilator
LN

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    <Edited by Host>

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