I've bought from iTunes but I then burn the tunes to CD-RW and rip them back to the computer, then lossless compress them to FLAC which is about 66% of the size of an uncompressed .WAV audio track but identical to the original. The 33% saving does add up, though off course it is not near the 10% compression that you get with AAC or MP3. To be honest, with storage memory so cheap and convenient (16Gb memory cards the size of your little finger nail, anyone?!) I would say it is a waste of time to rip your collection to anything less in fidelity than FLAC. Plus FLAC supports multichannel at greater bit depths of 24bit. A techie point, deviating from the original thread, but while we were talking about collections thought I'd mention it.