I've downloaded the trial of Aperture 3 to see if it's worth the upgrade from v2 which I bought ages ago but didn't actually use that much (I stuck with iPhoto). However, I'd appreciate some feedback on what to do with previews in v3. I have a Canon dslr that can shoot JPEG, RAW and RAW+JPEG - would the best option be to get Aperture to use the associated JPEG as the preview (I think you can do that...), or can I just skip having previews all together? I never really got to grips with Aperture before, so I am not really sure about what previews are all about . I am running on a 2.4GHz Core2Duo, 4GB RAM, GeForce 8600M GT graphics, running Snow Leopard. Thanks, Dave.