Found this site today (via Moleskinerie). It's managed by 2 writers - one in Portland and one in the UK. They provide a writing prompt every Friday, and you write a poem, essay, whatever you'd like by Sunday. The prompts so far have been: "What would you attempt if you knew you would not fail?", "Real life", "When we were wee...", and "Chocolate."
I'm in love with this for planner and personal reasons... 1. this a wonderful tool to get a glimpse into people's lives, as written responses to these broad-brush topics are so rich with life stories, and 2. what a great supplement to the APSW - helps us grow the writing skills. Happy scribbling.