A lightweight application for Mac OS that plays back FLAC files directly within iTunes. Handles a number of files and folders , supports track number and count. Does not support embedded artwork but it can be added via the Get Album Artwork option available in iTunes.
Fluke is a small Mac OS X utility that lets you listen to your FLAC files right within iTunes without needing to convert anything. Simply feed your FLACs into it and watch the magic happen!
The developer's website offers step-by-step advice to get Fluke up and running, as well as detailed information on how the app works.