Blender Git Commit Log

Cycles: blended box mapping support for image texture node. This enabled by
selecting Box instead of Flat as projection, and then setting the blend value.
Blend 0.0 will not do any blending between box sides, higher values will give
a smooth transition between the sides

This is useful for mapping image texture without too obvious patterns in a
way that looks seamless, without the need for UV mapping. This works basically
the same as the mango node setup that was posted, just a bit faster:

http://mango.blender.org/production/blended_box/