As eps pointed out in the previous thread (http://news.ycombinator.com/item?id=1772224) about side projects gone big, there were also an enormous amount of side projects that just went dead. I am sure many of HNers are curious to hear and learn from them.
So feel free to list what the project is, how did you come up with the idea, and of course, when and how did it go deadpooled.
If something did develop traction I would support it for years and years even if it ended up having very few members (livelog was one of those).
I find it difficult to kill off projects that have a few dedicated users, usually I contact them to find a way in which I can let the project go away without hurting their feelings.
Right now the biggest one that is on my 'deadpooled' list is the free drupal hosting site that I started a few years ago. At some point it had a few thousand domains on it, right now I think we're down to below 50, and every month one or two make the move to another hosting provider. Another three years and I can kill it.
Websites are like children, five minutes of work to launch them and you must support them the rest of your life ;)