If there is one thing that I'm a huge fan of its bakeries.  Every time I walk by a bakery in DC I'm compelled to try at least five or six things.  The brownies at the Firehook bakery aren't too bad, and the muffins at Marvelous Market pass my test.  However, these places are both chains.  If you want to try something exciting head over to Love Cafe on U st.  Love Cafe has a cupcake bar where you can pick your frosting and topings.   If you're vegan head up to Sticky Fingers in Columbia Hights for some great pastries and coffee.