I shoot RAW+fineJPEG using 8gb sd cards in the GF-1. Have been backing up the albums to an external hard drive and using the sd cards as my primary long term storage medium for the RAW/jpeg files. Assuming no exposure to extreme temps, humidity, UV is the data on the sd cards more or less permanent? Card prices continue to drop. Noticed yesterday when ordering another 8gb card the Sandisk 4gb class 6 card was only $6.00. Shooting RAW+fineJPEG on the GF-1 is ~150 images/4gb. Bit like paying ~$1/roll for 35mm film. Side note: co-worker of a friend found out the effects of low level, long term uv exposure to DVDs. Backup discs luckily for some expensive engineering/design software. Discs were toast. Lesson learned was to store dvds away from any light source.