Regular (unflavored) domestic and Canadian unflavored beers are Kosher without supervision. Dark beers brewed overseas may have grape extract added to the brew.
Mike’s Hard Lemonade/Ice Tea are not under anyone’s hashgacha.
I just called the OK, who confirmed that Smirnoff Ice in the states is NOT kosher, however it is certified in Israel because it is made from a Kosher base there. Smirnoff does not allow the sale of the Israeli product in America.
Red Bull is not Kosher because it's made with a hot fill system - on non-Kosher equipement.
Addendum - Skyy Blue is certified Kosher Parve when bearing the OK symbol. THe certificate expires in May 2005, so check back then.