Dodgepowerwagon.com, Joe Cimoch's site devoted to this wonderful truck in all its variants.
Bigelectric, Eric Hodecker's site devoted to the M37 military "Powerwagon" and its variants, although other military and Dodge vehicles do get discussed.

US Army Transportation Museum, located at Fort Eustis, VA. 

Olive Drab. Comprehensive site with information, links, and parts supplier lists for HMVs

Military Vehicles Email Lists, page from a fellow enthusiast listing links to various military vehicle email lists and forums.

Military Vehicle Parts Company, Jeff Smith's wiring harness, electrical parts, and restoration supplies.  Has a nice page showing 6, 12, 24 volt bulb cross references.

Owens Export Services, supplier of vehicles and parts, exclusive distributor of Gen Sato prints.

Sam Winer Motors, supplier of vehicles and parts.

Saturn Surplus, supplier of M561 full red lense tailights and other surplus vehicle parts.

Paul's Power Wagon Restoration, site showing his revival of a closed cab Danish Military truck.

Paul's Carryall Renovation, site showing his installation of a Cummins 4BT and other upgrades.

Rick Larson Military Stencils, Supplier of high quality stencils and decals for military markings.

NCMVPA, North Carolina Military Vehicle Presservation Association chapter.

PS Magazine, the US Army's Preventative Maintenance Monthly Magazine's website.

M-Series Rebuild and Repower, Charles Talbert's shop in Norwood, NC.  Excellent differential work including installation of 4.89 gears and lockers as well as restorations and Cummins repowers.  4038 Shankle Rd., Norwood, NC 28128, (704) 474-4683.

Carl's M37 Restoration, site with one of the best collections of M37 related links that I've seen and a truly wonderful restoration of a M37 as well.

Garbee and Garbee, the homepage of my brother and his family.
Graves Mountain Lodge, owned and operated by my extended family in Virginia.  I've spent enough time there that my co-workers get confused as to where I'm actually from, and where I'm going when I "go home."  (For the record, I'm actually from Lynchburg, Virginia, although I currently live in Raleigh, North Carolina)
Rob Edwards' homepage. 

Bill Bledsoe's homepage.

Rad Davis' hompage.

North Carolina Department of Transportation, my employer.

NCDOT Materials and Tests Unit, where I work.

Delco 10SI alternator installation notes at the Oldengine website.

Terminal Town, source of electrical parts such as fuse holders.

Diesel Equipment Company, Greensboro company where I purchased my electric wiper parts and the Datcon gauges.

The Foote/Custom Design, yard where I purchased the Cummins 4BT for my truck.

Cole Hersee, manufacturer of electrical components such as starter switches and battery cutoffs.

Datcon, Instruments made by a division of Maxima Technologies, the people that also own Stewart Warner, the OEM supplier of guages for the M37