I've just finished the latest Kim Harrison book Black Magic Sanction which is pure escapism. I've read all eight books in the series now. They are definitely comfort reads - they pull me into another world where for a time I can forget about anything that's troubling me. A bit like alcohol but with no side effects and a much quicker recovery rate when real life calls.
Other authors I like for comfort reading are Diane Duane, Tanya Huff, and Terry Pratchett. What are your comfort books? Or do you prefer chocolate? (I like combining the two.)