Audio Equipment Links:

(US) Pi Speakers:
http://www.pispeakers.com/contents.html
(UK) HiFiWigwam Forum:
http://www.hifiwigwam.com/forum.php
(US) Bottlehead Kits:
http://www.bottlehead.com/
Acoustic Signature Turntables:
http://www.acoustic-signature.com/index.php?article_id=9&clang=1
SME Turntables & Arms:
http://www.sme.ltd.uk/

Photography Links:

(US) Canon Photography Forum:
http://photography-on-the.net/forum/index.php
(UK) Talk Photography Forum:
http://www.talkphotography.co.uk/forums/
Multiblitz Studio Lights:
http://www.multiblitz.com/products/studio-lights/
Multiblitz Studio Light Downloads:
http://www.multiblitz.de/downloads/
Alexander Heinrichs - Vimeo site with some wonderful tutorials - unfortunately all in German:
but one of my all time favorite photographers:
http://vimeo.com/ahphoto/videos
The dedicated US Multiblitz retail site
http://multiblitzusa.com/
Flash Camera - great service and prices for camera's, lenses and so on.
http://www.flashcamera.co.uk/
Tin Jackson's Nikon D70 site - yes Nikon, but it does have a very useful document about how auto focus works testing lenses for focus accuracy.
http://focustestchart.com/chart.html
Harrison Cameras - Multiblitz agent in the UK
www.harrisoncameras.co.uk/Studio/
WEX Photographic - great service assured
http://www.wexphotographic.com/

Other Useful Links:

Specialist suppliers of all types of Lighting Online!
http://www.lamps2udirect.com/
Excellent Rechargeable Batteries - my preferred supplier
http://www.vapextech.co.uk/