I have no affiliation with them. I just thought E-villians would be interested. This blurb comes from the MyBART email:

Charles Chocolates: FREE Saturday Tastings

The Charles Chocolates Store is now open, and it's in Emeryville! MyBART members receive 25% OFF through March 31, 2007 at the store. Come by all day to taste a different selection of chocolates every Saturday in February and March. Mention myBART or bring this email in for the discount. In the next few months, we'll also be expanding to have a cafe complete with hot chocolate, homemade ice cream, coffee, and pastries.

Closest BART station: MacArthur