The Tiled development team has released the 0.5.0 version of the Java-based tile map editor Tiled! This release brings Tiled much closer to being a full-featured tile map editor, and is the most ambitious release thus far. New features include: improved tileset and image support, shared images, brushes, improved GUI, improved plugin support, and cursor highlighting. Also, a list of bugfixes.
Full list of changes:
http://tiled.rpgdx.net/
Webstart:
http://tiled.rpgdx.net/tiled.jnlp