DVD Release dates in the United States
Here's a few I've found:
Australia - March 3, 2009
MILK - March 10, 2009
Twilight - March 21, 2009
Marley & Me - March 31, 2009
Doubt - April 7, 2009
Frost/Nixon - April 21, 2009
The Curious Case of Benjamin Button - May 5, 2009
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I found this information over on IMDb and these dates are subject to change.
If I come across any more release dates I will post them here.