Just saw the wysiwyg wireframe editor in ux.stackexchange.com and I love it. Just the right amount of simplicity & capability.
Does this exist as a stand-alone site? I'd love to be able to create simple wireframes that I can revise later on without the typical we'll-give-it-to-you-for-free-this-month-and-change-the-rules-next-month rigmarole.