Rather late on this, but I just wrote a Wavefront OBJ file parser for the Vuforia format - on the contrary, what thechrisberry wants. Subscribe to stackoverflow doyen rodrigo-silveira for the initiative idea provided.
Vuforia samples have mostly simple object models - cubes and teapots - so it won't be necessary to make an OBJ file from them and import it into Blender. You just need to convert the vertices, normals, tecodes, and arrays of indexes of Vuforia samples to the OBJ text format (v, vn, vt, and f elements) and include the PNG texture file from the sample.
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