Fix the dockable dialog drag and drop problem under vista.

Add Column mode edition feature (Menu "Edit->Column Editor...").

Fixed "To UPPER/lower case" bug in column mode.

Fix the display bug in User language define dialog.

Add new feature which backups files in a user specific directory.

Fix TeX syntax highlighting corruption problem while switching off then switching back to current document.

Fix User Define Language extension recognition problem for sensitive case (now it's insensitive).

Add a menu entry to access to notepad++ plugins project page.