Never hardly ever.
When people come over and ask what to bring I always say dessert.
This is partly because baking is not such a great activity for the attention deprived (we tend to put too much or too little of ingredients and burn things) AND it is a terrible activity for those of us with out self control, since a dozen cookies lasts all of 12 minutes. And that's when the kids are asleep.
Unfortunately, though, I am required to bring something for some function.
Enter, the TWO ingredient Lemon bars over at "I'm a Lazy Mom" (my hero ;)
Angel food cake mix and lemon pie filling (plus powdered sugar to top.
Click the pic to link to the actual awesomely awesome recipe.