Yes, there's free frozen yogurt to be had on opening day at Red Mango, 10942 Weyburn Ave., Westwood Village from 4-6 p.m. These guys supposedly started the whole craze back in Korea, so let me know how it is.
Lately I've been liking Milano Freezer the best -- they're on Olympic in Beverly Hills and a block or so west of Pinkberry on Melrose. Better prices, nice smooth consistency and the green apple flavor is most pleasant on a hot day. They've also got gelato for the traditionalists.
I like ceFiore better than Pinkberry too -- strange name, but they've just opened in La Crescenta and Encino and will soon open in Arcadia. They do a swirl of two flavors at no extra charge, and the green tea has a good clear flavor.