Hello all I am about to pull the trigger on a Dslr and plan on shooting raw. I am currently running Tiger on a iMac Core Duo with 2gig ram. When looking at the Aperture 2 specs it says: Leveraging the next-generation RAW image processing in Mac OS X Leopard, Aperture 2 delivers images of astounding quality, offering superb color fidelity, increased shadow detail, reduced noise, and advanced highlight recovery. Realize the very best results from every image by applying new RAW Fine Tuning controls, adjusting RAW rendering on an image-by-image basis. Am I really at a disadvantage by still running Tiger or what? Are we just splitting hairs or is this a major advancement with Leopard? If I run Aperture 2 and/or iPhoto 08 which both have the RAW conversion capabilities for the new Canon XSI what am I missing by using these programs with Tiger. In the words of Vinnie Babarino : "I'm so confused!"