Melt chocolate in a heavy glass bowl in the microwave by cooking in 30-second intervals. Stir between intervals.
Beat egg yolks until frothy. Mix egg yolks into melted chocolate with a rubber spatula. The chocolate will seize up a bit, but don't worry.
Beat egg whites until stiff. Fold into chocolate mixture.
Beat 2 cups whipping cream with 6 tablespoons sugar until soft peaks form. Fold sweetened whipped cream and vanilla and rum flavorings into the chocolate mixture.
Spoon or pipe ½ cup mousse into each of 10 serving dishes. Cover and chill. Mousse will thicken as it chills.
When ready to serve, whip remaining ½ cup whipping cream with 2 tablespoons sugar until stiff peaks form. Pipe on top of mousse and garnish with a raspberry.