2L- the Nordic Sound
Blue Coast Records
Bowers and Wilkins - Society of Sound
Gimell Records (96k/24bit, 48k/24bit, 44.1k/16bit of the The Tallis Scholars)
High Res Music
High Definition Tape Transfers
High-res download test bench (free samples only)
Internet Archive (dot org) - has some high res available - including Hungry Lucy!
LessLoss Audio - Free Sample High Resolution Audiophile Recordings
See also the thread "Where to Download Lossless Music".