Much tripe to be had in this genre, but my local library shelves ache with them. When you find a good one, they can be really inspiring, funny and eye-opening.
So what gems are to be found and why do they deserve attention? What has surprised you(NB not a big fan of weepy hard luck tales, or Tragic Life Stories as WHSmiths would 'ave it)
Fr'instance, I loved the Joe Orton Diaries - very witty, bitchy expose of theatrical folk in the 50s and some great name-dropping of the likes of Kenneth Williams.