Vincent totally articulates what I think about the subject. I went digital six years ago, and it’s been a long and interesting road. I’ve been able to shoot thousands and thousands of photos and a lot of times they get lost in my archive. But I have been using Aperture for about two and half years now and it has really allowed me to process and edit the new, but also visit the past very quickly. I’ve found some old gems that I totally missed at the time, but have become some of my best work. I never delete and my library is about 400gb now.
Have a read a Vincent Laforet’s blog has some great thoughts about if you should delete your photos. He is a world renowned photography and just recently got back from shooting the Olympics.