In a heavy saucepan over medium-low heat, combine chocolate and 2/3 cup cream. Cook and stir until chocolate is melted and mixture is smooth. Cool to room temperature.
In a small mixing bowl, beat remaining cream with confectioners' sugar and vanilla until soft peaks form. Fold about 1/4 cup into chocolate mixture. Fold in remaining whipped cream mixture. Spoon into dessert dishes. Cover and refrigerate for at least 2 hours. Yield: 8 servings.