I use Apple products and rip to AIFF for use with iTunes and the various players that interface with the iTunes library. AIFF, unlike WAV, has good metadata support and i'm also using it for archive copies. I've also converted my library to FLAC (with no compression) for future-proofing and for use with players NOT interfacing with iTunes. The transcoding is simple with apps like Max or XLD and can be batch converted. FLAC has great metadata support also. For my iDevices I use mp3's converted from AIFF.
