I have released the 0.03 version of my Blender exporter on sourceforge: http://sourceforge.net/projects/colladablender/
The exporter output .dae files according to the 1.3.1 specification.
It features export of meshes(position, uv and normal), materials with texture info, cameras and point lights. It also outputs transform and parent information through the scene element.
If you're having questions about the script or anything other related to this please feel free to post here or on the sourceforge page.
EDIT: After some testing it seems that the script happened to use specific Blender 2.37 API calls so you need the latest version of Blender (which comes bundled with Python 2.3) if you want to use the script.