Great for assembling scrap books of images - settings, moods, characters, inspirations, details, books, authors, booklists, etc. Excellent search engine of collective obsessions. Also addictive.
I just discovered this app - iTunes blurb below:
A Novel Idea is the premier tool for plotting your story and recording bursts of inspiration. Use its simple interface to create your characters, locations, scenes, and novels and then link them together to create your story's plot. Use the Idea feature to quickly jot down your creative sparks and link them to your story elements.
Downloaded for a play. Looks good - pity no timeline though. Another good thought capturer I was using was Werdsmith but I think Novel Idea has more features.
Take a story by a writer you really, really admire - preferably a short short story that won't take for ever to reproduce. Analyze it in minute detail: from word choice to sentence length. Now, choose a different setting and different characters with different dreams from that of the originals, and write a copycat story, following the exact structure and tone of the original.