While The Hustle has had its day and the Macarena (gah!) is still being danced at recent weddings I’ve attended, the new cool line dance seems to be The Cupid Shuffle. According to Dance Jam, the Cupid Shuffle is similar to the Lil Mama G-Slide, the Cha Cha Slide, and Country Line Dancing (though its dancers surely demur from any Achy Breaky Hearted comparisons).
All I know is that even the cool kids are doing this one, so it must be cool.
More:
Cupid’s Official Website
Cupid on the Wikipedia
Cupid Shuffle on Wikipedia
Dancing Videos Blog 
Oh goodness, I unknowingly did the Cupid Shuffle at my work Christmas party? Does that make me cooler or less cool?
Kim, it doesn’t matter what you’ve danced. Ss long as you dance at all, the whole world is cooler.