TwentyTen is a great new theme for WordPress, However the Visual editor is limited to 640px content width, This restores it to full width editing
TwentyTen is a great new theme for WordPress, In my mind however, It suffers one fault, The TinyMCE editor is limited to just 640px content width. This is to allow you to get a visual indication of the layout of a post (For example, Floating images and text wraping). This plugin removes the ability for the theme to modify TinyMCE's content width.
See http://dd32.id.au/2010/06/01/introducing-twentyten-remove-max-editor-width/ for more information.