The preferred locations for testing according to this systematic review are filled green in the image. As the independent addition of the monofilament to visually inspecting for deformities, pressure marks, cracked skin, infected nails, evidence of prior ulcers, and other findings is not clear in the major trial of screening (http://pubmed.gov/8498761), it seems we should limit our time to testing three points rather than 10.
This has been added to http://en.citizendium.org/wiki/Diabetic_neuropathy#Screening
Feng Y, Schlösser FJ, & Sumpio BE (2009). The Semmes Weinstein monofilament examination as a screening tool for diabetic peripheral neuropathy. Journal of vascular surgery : official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapter, 50 (3) PMID: 19595541