Classical music forums and social networking for composers, performers, amateur musicians, instrument makers, scholars, teachers, students and publishers:
A comprehensive online discography of Bruckner’s symphonies and orchestral works, which attempts to list every Bruckner recording on offer to the public:

TNT-Audio's campaign for true stereo recordings:
Czech Music Direct features a page about Orchestral Concert CDs:
Czech Music Direct and Czech Everything
Czech Music Direct’s page about Orchestral Concert CDs
The Federation of Recorded Music Societies (founded 1936) provides co-ordination, promotion, services and support for over 200 recorded music societies in the UK, as well as organising regional and national events and producing a twice-yearly magazine:
The Federation of Recorded Music Societies
Sarabande Co. Ltd is Orchestral Concert CDs’ Japanese distributor (site primarily in Japanese):
Peter Katin appears on several OCCDs issues (CDs 2, 3 and 11):
Sebastian has written some short introductory articles about choosing hi-fi equipment and explaining various terms, which newcomers to the subject may find helpful:
Favorite-Classical-Composers.com