I am developing one, I already use it on production, for a cms and for a forum. Works fine on all browsers except ie :( Planning for next weeks to make a page with docs and to fix ie bugs.
A few features that I am proud of: - inserting html (e.g for inserting code of a embedded video from youtube) - automatic resize to a given width and height (via flash) and upload to imgur You will see that it is quite advanced and its js+html+css is less than 50 kb and that without minifying. ~ 120kb with icons and swf that uploads to imgur, but requires jquery. I use jquery stored on google cdn About imgur uploader: - it resizes and converts to png or jpg - images become smaller - e.g if you have a 1Mb image and you have set to be resized to 800x800 it will be ~ 100kb after uploading. - your image is stored to an external server for free - imgur.com take a look and if someone is interested I can help you to include it in your pages http://fermer.md/fermer/static/bolteditor/index.html ideas and comments are wellcom

