Exactly what excited and then disappointed me. It's a great idea, but I think making it a service will make some people uncomfortable with natural use cases (ex: diary?) for a tool like this. I have been working on something (probably simpler than, but similar) like this that would be self-hosted, mostly because there's a lot of stuff I didn't want to store on Trello or other "cloud" knowledgebase tools. The markdown editing view from the product page is almost exactly what I was aiming for, so I really like it :)