The only trick to this fudge is not overheating the chocolate. It takes as few as three 30 second intervals in the microwave to melt. Just remember to stir a lot after every zap. The less time in the microwave the better. Like I said before, you can still use a double boiler if you want, the microwave just makes it that much easier (and leaves fewer dishes to wash afterwards). The final product is not going to be as good as something from a fancy fudge shop, but it's still worth trying. If you don't overheat it, it will be creamy, and depending on the additions it will have a nice texture.
I'm including my family recipe for you to try if you wish. It takes a few tries to master unless you are a skilled candy maker. I might try it again to see if I can make the instructions more descriptive. I don't plan on making it very soon... all of the holiday candy is making me feel guilty about my lack of exercise during our visit home.
2 C sugar
3/4 C milk
5 Heaping Tablespoons of plain or chunky Peanut Butter
Mix ingredients in a heavy bottom saucepan. Simmer over medium heat until it reaches soft ball stage, stirring constantly. (Check for soft ball stage frequently). Remove from heat and beat with a hand mixer on medium-high speed until mixture loses most of its gloss. Transfer to a buttered pie tin or 8x8 square pan. Let cool and cut into squares.