Here's my chocolate mousse recipe. If you follow me on Twitter you hear a lot about it because I make it quite often.
For 4 servings you'll need:
125gr of dark chocolate (NOT milk chocolate, I INSIST, it has too much sugar content and doesn't melt properly)
1 tablespoon of icing sugar
1 can of cream
1 Persian cat (optional)
au bain-marie". If you're skilled with your microwave, you can try to melt the chocolate in there but personally, I always end up with a gooey unusable blob.
And no, Eugénie the cat didn't move an inch during the whole time.