Thanks Jeff! All of this is great feedback.

Most of the things you've pointed out are on our roadmap. For example, you can email us as of today, and we'll help you set up your custom domain with Known.

Separate feeds for content types do exist, via the "filter content" pulldown. Each of those (and every page in Known) has its own RSS feed if you want that, too.

Apps for iOS and Android are probably important, and we need to think about the best way to make that happen.

And finally, markdown via a plugin would be a really great idea.

More - much more - soon! (Hint: publishing is only half of the picture.)