Thanks! I may be preaching to the converted (no pun intended) on this one but:
To anyone submitting, please remember that submissions are not lossless if they have EVER been one of the following formats:
MP3, MP4, M4A, M4P, MP2, OGG, AAC, WMA, RA, RM, SPX, VQF
Lossless formats include:
FLAC, WAV, AIFF, APE, SHN, TTA, WV, OFR
The most common example I see is someone that has a CD burned from MP3s and rips it to WAV or FLAC and tries to tell me that it's lossless. Please don't do that. Once something has been a lossy format the quality can never be restored. That's one of the key reasons for doing this project in the first place, so let me know if there's any questions before proceeding.