Websound.ru has opened large blind testing.
Anyone interested could visit their page at http://websound.ru/blind_test_e.htm and take part.
Codecs used:
MPEG-4 AAC, Sorenson Squeeze v3.5 (sor)
MPEG-4 AAC, QuickTime Pro v6.3 (qt)
MPEG-1 Layer III, Lame Encoder v3.90.3 stable bundle (lame)
MPEG-1 Layer III, ????? Fhg MP3 ?? CoolEdit Pro 2.1, High Quality Codec (fhg)
MP3 Pro, ????? Fhg MP3 ?? CoolEdit Pro 2.1, High Quality Codec (fhgpro)
MPEG-4 AAC, PSYTel encoder v2.15 (psy)
Ogg Vorbis, oggenc 1.0 (ogg)
Ogg Vorbis GT3, OggEncGT3v1 (ogt)
MusePack, mppenc 1.15r (mpc)
WMA9, MS WMA9 encoder (wma)
If you're interested in participating, feel free to visit their page and ABX some samples.
Results could be quite interesting.