Besides just the lovely title, it's a post that struck a chord with me. You should head over and check it out here. Also be sure to read the blog post she references from Lynn Viehl on a lost story. Both are interesting posts that had me thinking (and dreaming about the day I can look back and just have 49 page manuscripts I've forgotten about!)
As I mentioned in the comments on Marjorie's blog, I keep a moleskin notebook (I love knowing Hemingway used the exact same one) that is always with me for when any story idea, character, plot twist, etc pops into my head. Every so often I find myself flipping through those pages and it does spark my creativity. It also makes me smile to know that my current WIP is not the end - just the beginning of a lifetime of stories I have in me.
How about you - where do you keep your story ideas? Do you have a writing journal or are you hi-tech and keep everything in files on your computer? How often do you read back over your ideas?