I hope these links prove useful... I shall add new and relevant links as and when I find websites that may be of use.

Here're just a few to get you started - I'll update it in alphabetical order once I get the whole list of links compiled.

Sound Foundation
d&b Audiotechnik
Turbosound
Electro-Voice
Shure
AKG
Sennheiser
ASS (Acoustic Sound Systems)