Seems vintage wasn't a hot look for the red carpet this year, sadly. But I did spy one nominee, young Ellen Page from Juno fame, wore a simple black vintage dress by Jean Louis Scherrer.
Oscars Red Carpet: Ellen Page | ellen page, 2008 academy awards, 2008 Oscars | FabSugar - Fashion & Style.
I never heard of Jean Louis Scherrer myself so I did a little internet research on him.
In 1955, his talent took him to the house of DIOR, where he worked with Yves St.LAURENT. When St. Laurent took over the house of Dior after the master died, Scherror joined the house of Louis Feraud till 1961. He set up his own house in 1962. His first collection was shown in the vaulted cellar of a wine dealer. More.
More info on the designer at Fashion Windows.