I love http://sixsentences.blogspot.com/ It's such a friendly and fun site. I love 'em even more now though because I am proud to say I have just won their second contest, which was to write a six incorporating the prompts Jessica Rabbit and Orange Sherbet.
Sara Crowley is a writer, bookseller and reviewer. She won The Waterstones Bookseller Bursary, and her novel in progress - Salted - was runner up in Faber's Not Yet Published competition. Her short stories have won prizes and been published in many lovely places, online and in print.