Some inspiration for wrttn actually came from markdownr.com. Originally I set out to build a similar layout, but I decided against it because of a space thing.
A suggestion for that would be to make parts of the site using your notepad app. Place text in notepad asking the user to edit it and allow them to add their own content.
I sort of know what you're saying but not really. You mean having text inside the textarea (with, say, textile/markdown basics? though I added a textile reference) and delete it on focus?
Yes. Basically, it tells you what the site is within the demo area without having to have the initial landing page, complete with textile markup, then, delete it on focus.