I've made some enhancements to the Color Browser plugin. The biggest change is a complete rework of the all the buttons for inserting a color into an editor. Going on the assumption that a single format will typically be used for any given project I have made it easier to pick a single format and easily insert colors in that format. Of course you can still pick any format you wish.
Inserting a color into an editor now automatically replaces an existing color reference if the cursor is currently within a color reference.
Added support for javax.swing.plaf.ColorUIResource in addition to CSS/HTML and java.awt.Color.
Let you specify whether hex values should be in upper or lower case.
Thanks to Robert Beeger for many of these ideas.