Cue Sheet
A cue sheet, or cue file, is an ASCII (plain text) file that specifies how the tracks of a compact disc should be laid out. Cue sheets commonly have a ".cue" filename extension. They were originally used for the CDRWIN CD recording program, but are also used with other CD software as well as music and video playback software.
M3U
M3U (MPEG Audio Layer 3 URL) is a computer file format that stores multimedia playlists. It was originally implemented in Winamp, although it is now supported by many applications, including VLC media player, XMMS, foobar2000, JuK, Real Player, Windows Media Player, iTunes, QuickTime Player, Yahoo! Music Engine, JetAudio, RokuLabs SoundBridge, and Playstation Portable.
I wasn't able to find anything in Wikipedia about .log files. Perhaps someone else know?
Bueller, Bueller?