A first Release Candidate for Blender 2.59 has just been released. This release fixes 132 bugs. Except this contains some good addons. Additions include fly modeand Node UI improvements, 3D mouse support for 3D Connexion devices, for more natural control during view navigato, improved keymap editing or Ivy Generator, which adds the ability to "grow" curves over an existing mesh with the option of adding leaves and adjusting many parameters for the final result.
If you want to see full list of changes you sure follow link bellow.
Source: Blendernation