While I love coffee and hot cocoa, (and quite often, mixing the two), my favorite hot/warm beverage is probably heated apple cider. Mulled is nice, though if the apple cider is good enough it doesn't necessarily have to be mulled with the spices and whatever.

My favorite apple cider I've found is this SweetTango cider. It's insanely sweet but sort of earthy at the same time. So good. Nom nom nom. less