Wow, I didn't thought that it would take that long since I created the first prototype at the end of 2007. The code itself didn't take too long, there were only a few problems due to the restrictions of being in chrome and a few differences (one problem that still remains is the fact that no tooltip is shown in the toolbar icons, I still haven't tried to find out if it's just a bug or there is some workaround that doesn't means rewritting the toolbar with XUL.
One interesting fact about running inside chrome (besides the fact that the clipboard buttons work without the need of any other special setting) is that images from the clipboard can be pasted inside the content.
Yes, that means that if you have a document with some images inside and try to paste it inside Write Area, those images will be shown while you are editing (trying to do it in any other site won't show anything because it's using a path to your computer). But when you press the save button the images will remain in your Hard Disk, and they won't be shown in the final web.
But let's think about it: Write Area is running as an extension, it has the ability to read local files, so that means that when the Save button is pushed, I can check if there's any image in the content that it's pointing to the local disk, and send it to a web server, get the proper path to use that image and replace the original reference with this one.
It needs a little coding and a way to know where to send the pasted files.
Wouldn't it be really nice? You just write your content, prepare any screenshot and paste directly there, and when you press Save everything is uploaded (or maybe even after pasting, the file is automatically uploaded while you keep on writing)
Ok, let's not digress any longer and install Write Area right now!