Tesla used cylindrical cells (18650s) in the Roadster and now again in the Model S. Presumably the same cells in the Model X due in 2014.
Most of the other "major" EV industry players have gone the pouch cell route. Nissan Leaf, Chevy Volt, Zero (switched from Taiwan Molicel cylindrical cells to Korean EIG NMC pouch), Brammo (switched from American Valence LiFePO4 cylindrical cells to ?? NMC pouch in the E+ and the Empulse).
Mitsubishi seems to be a standout in that they're using (rectangular) prismatic cells.
Unsure what Toyota, Renault, Ford, and GM's Spark will / do use.