ummm, keep the 48 kHz files archived on media... then resample (48>44.1 kHz) the audio and burn audio cds for yourself if you so desire...?

btw, if you use Nero (i know, you have a Mac, but i thought i read before you have a PC as well... but i could be, and probably am, wrong on that), you can do the simple drag & drop of the WAV files in the Audio CD compilation window, and it automatically resamples to 44.1 kHz. of course, if you used WavLab or some similar type program, i'm sure the results would be better... but if you're just looking for a quick and dirty way to get the audio on cd for yourself only on a commute to work, i find the Nero resampling *acceptable* in that type of circumstance.