Where can the latest API documentation be found? Some of my scripts scripts are broken e.g.

bpy.ops.pose.armature_layers(layers=sel_layers) # 2.6 api


has been (unnecessarily) renamed to

bpy.ops.pose.bone_layers(layers=sel_layers) # 2.7


In the 2.71 RC1

bpy.ops.anim.keyframe_insert(type='BUILTIN_KSI_LocRot')


leads to an error:

TypeError: Converting py args to operator properties:  enum "BUILTIN_KSI_LocRot"
 not found in ('Available', 'WholeCharacter')


And seems no longer to respect the bone/armature layers.

The latest documentation I found is:

http://www.blender.org/documentation/blender_python_api_2_70_5/

which is not accessible from the navigation pages from blender.org, manipulating the version part of the URL neither works (tried 2_71, 2_71RC1, 2_71_RC1). 

Where can the 2.71 API be found?
Update
You can now use http://www.blender.org/api/blender_python_api_current/ to link to current API documentation. The difference from the old redirect is you can now link to specific parts, search results, etc. on the latest docs.
You can still specify a specific version if needed, e.g.
http://www.blender.org/api/blender_python_api_2_76_2/ goes to the 2.76 specific documentation.

Origonal answer
This url is always redirected to the latest API documentation.
It redirects to http://www.blender.org/documentation/blender_python_api_*version*