Collaborative Writing

Today's lecture with poets Denise Duhamel and Beth Ann Fennelly was about collaborating with another artist/poet/photographer/book maker/collage artist, this is a very exciting idea to me because I like the idea of not settling for one type of creative work. Denise talked about exquisite corpse which I had never heard about. What are your feelings on collaborative writing?
Lovingly,
The Writing Nag