Hardware Manufacturer
B&K, Carada, Denon, DirectTV, Dish Network, DVDO, Emotiva, Harmon Kardon, JVC, Kenwood, Magnepan, Marantz, Onkyo, Oppo, Outlaw, Parasound, Pioneer, NHT, Samsung, Sony, SVS, Tivo, Toshiba, URC, Yamaha,

Cables
Better Cables, Blue Jeans, Cable Asylum, monoPrice, Percy Audio,

Digital Photo
Canon, Digital Photo Review, Digital Picture, Fred Miranda, Imaging Resource, Kirk, Nikon, Photo.net, RRS, Scan Cafe, Steve's, Strobist, Wimberley,

iPod
BSE, Contour, Dice, iLounge, iSkin, Power Support, VAIS,

Buying Equipment
Accessories 4 Less, Audio Advisor, Audiogon, B&H, Best Buy, Costco, craigslist, Crutchfield, Dakmart, Digital Connection, Dish Depot, Dish King, HiFi.com, One Call, Projector People, Sears, Thomas Dist., Vanns, Videogon, Visual Apex,

DVDs
Amazon, Deep Discount DVD, DVD Price Search, Netflix,

Discussion/News
Audio Review, AVS Forums, dbstalk, Digital Bits, DVD Benchmark, Home Theater Forum, Home Theater Spot, Remote Central, Rting, Sound & Vision,