When it starts to get cold outside I pretty much make hot chocolate every night until summer begins, ha! Maybe not quite that often but I seriously love, love, LOVE hot chocolate. Here is my favorite recipe{thank you M.S.}:
3/4 cup "Chocolate Sugar--A mix of 1 part cocoa powder and 2 parts sugar until it tastes sweet and is lighter in color. I never measure the two and I usually just make a bunch and keep it in a baggie.

1/4 cup water
1 teaspoon Mexican vanilla (I get mine at Kneaders)
2 cups fat-free half and half
2 cups whipping cream
Combine the "chocolate sugar" and water in a medium saucepan. Bring to a light boil for 5 minutes, stirring constantly. Add half and half, whipping cream and vanilla to chocolate sauce in pan and bring to a light boil. Be sure to stir frequently to avoid scorching.
And for those of you who want even more rich goodness in a cup try this...
Instead of using the "chocolate sugar" and water method, heat 1/2 cup whipping cream to a low boil and then combine with 4oz Guittard Chocolate chips. Then add the other ingredients above for a candy bar in a cup!
Either recipe will surely blow your mind!
Enjoy! :)