Basic - just like the old Dolby Digital & DTS - Studios include 1 or 2 types on a film along with
good old Dolby from the Standard DVDs. Most sound better, but not all (SOS Man)
Linear PCM (LPCM) - up to 8 channels of uncompressed audio. (mandatory)
Dolby Digital (DD) - format used for DVDs, 5.1-channel surround sound. (mandatory)
Dolby Digital Plus (DD+) - extension of Dolby Digital, 7.1-channel surround sound. (optional)
Dolby TrueHD - lossless encoding of up to 8 channels of audio. (optional)
DTS Digital Surround - format used for DVDs, 5.1-channel surround sound. (mandatory)
DTS-HD High Resolution Audio - extension of DTS, 7.1-channel surround sound. (optional)
DTS-HD Master Audio - lossless encoding of up to 8 channels of audio. (optional)
Plenty of discussion on all the forums - one example
BD Player Audio Support Comparison - AVS Forum
Much discussed here as well
Have fun