As the New York Magazine said in the Best of New York 2007 eating and drinking:

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ONE WORD—SMORGASBORD!
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Aquavit

65 E. 55th St.; 212-307-7311

What to get: Sunday’s Swedish spread is stocked with all the herring, gravlax, and meatballs you can eat; $48 includes a Carlsberg.

If you like Scandinavian food (and I *love* it) it's an amazing deal. I've eaten at this restaurant many times (I try to go whenever I'm in NY) and being a huge fan of all things smoked and pickled and fishy I'm in heaven there for Sunday brunch. I mean, nine different kinds of herring! Of course they have lots of yummy non fishy and non smoked/pickled/marinated things too!