Converting RAW files to DNG!
RAW files are not open and are exclusive to each camera manufacturer. Adobe released an open RAW format called DNG. You can easily convert your photos to DNG using the "Adobe DNG Converter". The conversion is completely lossless and you actually save hard drive space. The advantage is that there are a lot more chances that DNG will still be readable in years than a closed format. You can get the Adobe DNG Converter here from MacUpdate.