Really good but you should merge in the Tiny MCE button plugin

This plugin is how things should be done, a great lightweight way to drop a versatile grid into any theme and to keep it when you change themes.

I wish that the TinyMCE button add-on by a different author was standard in this plugin as I often forget shortcodes over time and need to constantly look things up even though [column] is fairly memorable, the grid and span elements are not so.