LDK is a set of tools that are designed to make 2D game development easier and faster. It's divided into several programs,each one with it's own functionality. It consists of a Character Editor (create characters with proper animations) an Effect Editor (for special effects and particle systems) and the World Editor where all the functionality of a game is done. This tool is being developed by PauldronGames.
A lot of improvements have been made.
It also shows a less strict assets browser, so you organize the assets the way you feel more comfortable with.
You can also see a little window with the layers you have in your level.