This is really excellent. I like the concept a lot. Here are some of the things I really like:
- This uses a proportional font. Most web-based editors I've seen so far used monospace, which, frankly, makes them bad for writing prose. The font is really nice, too. Also, importantly, proper line spacing!
- The F11 feature is clever.
- The word count on the bottom is unobtrusive and elegant.
My use case is writing long (30.000 words+) documents with few formulae. Right now I use Vim, which is nice feature-wise, of course, but not perfect for prose. I write using "markdown" markup, for headings, italics and so forth. I use pandoc to turn it into LaTeX and xelatex to turn that into a PDF. It works beautifully, even for academic texts.
What I love about Vim are its key-bindings. It would be fantastic to add this to wabasabi. I don't whink I'll use another editor which doesn't have this feature. I'm sure I am in a tiny minority in this respect.
You could also add pandoc integration in the future. It's a great piece of software. It also has a few extensions to markdown, including footnotes and bibliographic references. It's extensible as well.
I just wrote this comment using wabisabi, and I like the experience a lot. Are you going to turn this into a commercial project? If you need help, send me a mail (in my profile).