I do really like the idea, I have exactly the same problem. When I shut down an old project, a white page and a short message about it usually remains. I have already thought about making a static html page, where I can simply add some screenshots (but I haven't gotten around to that yet). Just to show what I have been working on and for my personal portfolio. A pity, actually. - In short, thumbs up for the idea of me. But the point with the longevity of the service (as Marc already said) is a very important one from my point of view, because otherwise the service doesn't make much sense.