Just been watching some advanced PS CS2 training I have on DVD, when it started to mention the benefits of converting RAW images to Adobe DNG format. Alledgedly it's a lossless format that also has lossless compression (10MB reduced to 4MB) , so should be better than your original RAW files.
Convertor can be downloaded from
Adobe - Digital Negative (DNG)
Must admit the thought of saving 60% disk space, means I can backup more images to a single DVD
Anyone out there use it ?