I really like what you've started here from what I can see from the user side, especially the clean, mostly text interface.

One suggestion: W3T has a very option that I've not seen on other boards to let the user adjust the width of the composition box and, IIRC, set the font size. Because browsers vary so much in the way they handle text boxes, the appearance will vary greatly with the user's display, and the users preferences also vary greatly, it's extremely useful to be able to give users some control over composition boxes.

Right now, I'm squinting into what I consider a tiny box with text too tiny for my tired, old eyes. :)
samantha