Resources

Headphone Manufacturers 
AKG

http://www.akg.com/site/powerslave,id,2,nodeid,2,pcategory,33,_language,EN.html

Alessandro
http://www.alessandro-products.com/headphones.html

Audio-Technica

http://www.audio-technica.com/cgi-bin/product_search/headphones/headphones.pl

Beyerdynamic

http://north-america.beyerdynamic.com/shop/hah/headphones-and-headsets.html

Denon
http://usa.denon.com/US/Product/Pages/ProductLanding.aspx?CatId=f28e56fc-7d35-4cf7-88d8-f6ce5abeb128&SubId=175b9aad-12a5-4ba1-9bc0-de397b66258a

Fischeraudio

http://www.fischeraudio.com/series.php

Fostex
http://www.fostexinternational.com/docs/products/RP-Series.shtml

Grado
http://www.gradolabs.com/frameset_main.htm

Koss
http://www.koss.com/koss/kossweb.nsf/p?openform&cm

MB Quart
http://wiki.faust3d.com/wiki/index.php?title=PMB_/_MB_Quart

Phiaton

http://www.phiaton.com/

Sennheiser

http://www.sennheiser.com/sennheiser/home_en.nsf/root/private_headphones

Shure

http://www.shure.com/americas/products/earphones-headphones/headphones/index.htm

Sony

http://pro.sony.com/bbsc/ssr/cat-audio/cat-headphones/

http://www.sonystyle.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10551&storeId=10151&langId=-1&categoryId=3729&N=4294955698

Stax
http://www.stax.co.jp/Export/ExportProducts.html

Ultrasone

http://www.ultrasone.com/index.php/en/products.html

Amplifier Manufacturers 
Audio gd

http://www.audio-gd.com/En%20audio-gd.htm

Audio Tailor

http://audiotailor.com/Jade_OTL.htm

Bottlehead
http://www.bottlehead.com/store.php?crn=44&rn=442&action=show_detail

Darkvoice
http://www.audiophilechina.com/products1.asp?S_id2=2&s_id=25

iBasso
http://www.ibasso.com/en/products/

Little Dot
http://www.audiophilechina.com/products1.asp?S_id2=2&s_id=24

Meier
http://www.meier-audio.homepage.t-online.de/

Music Hall
http://www.musichallaudio.com/products.php?l=3&c=1

Musical Fidelity
http://www.musicalfidelity.com/products/V-Series/V-Series.asp

Musical Paradise
http://www.musicalparadise.ca/mp/

Nuforce
http://www.nuforce.com/

Ray Sammuels
http://www.raysamuelsaudio.com/#

Schiit
http://schiit.com/

Woo Audio
http://www.wooaudio.com/products/


Online Resources
Computer Audiophile

http://www.computeraudiophile.com/

Head-fi
http://www.head-fi.org/

Headfonia
http://www.headfonia.com

Stereophile
http://www.stereophile.com/

The Well Tempered Computer
http://www.thewelltemperedcomputer.com/


Reviews
Buying Guide by Price Range
http://www.head-fi.org/wiki/buying-guide-headphones-by-price-range


Joker's Portable Headphone Shootout
http://www.head-fi.org/forum/thread/433318/shootout-80-portable-headphones-reviewed-beyerdynamic-dtx-300-p-koss-ksc35-added-05-06

Joker's IEM Review
http://www.head-fi.org/forum/thread/478568/multi-iem-review-167-iems-compared-xears-resonance-ps120pro-added-05-13

Saint.Panda's Closed Headphone Shootout
http://www.head-fi.org/forum/thread/128983/15-closed-headphones-2-canalphones-and-a-discussion-on-frequency-graphs-reviews

Skylab's Tube Amp Shootout
http://www.head-fi.org/forum/thread/402585/review-summary-a-ranking-of-31-tube-and-tube-hybrid-headphone-amps

Skylab's Portable Amp Shootout
http://www.head-fi.org/forum/thread/214588/review-portable-amp-roundup-56-portable-amps-reviewed-and-compared-final-update-12-20-10-added-rsa-sr-71b

The Well Tempered Computer, USB DACs
http://www.thewelltemperedcomputer.com/HW/USB_Audio.htm

David Mahler's Review of 20 Headphones:
http://www.head-fi.org/forum/thread/524569/review-20-headphones-compared

AV Guide of the RE262
http://www.avguide.com/review/hifiman-re-262-ear-headphone-playback-42

Milosz's A / B Comparison of amps for the LCD-2
http://abtests.org/ns/index.html

People I follow
http://www.head-fi.org/user/project86
http://www.head-fi.org/user/thewuss
http://www.head-fi.org/user/skylab
http://www.head-fi.org/user/headphoneaddict
http://www.head-fi.org/user/clieos
http://www.head-fi.org/user/ljokerl
http://www.head-fi.org/user/panges
http://www.head-fi.org/user/avu
http://www.head-fi.org/user/joelpearce
http://www.head-fi.org/user/davidmahler