I expect you others already know, but Nikon View is now in an NX version and it is far niftier than the browser function within Capture NX.

Aswell as auto download and thumbnail preview of .nefs, it does a slideshow (nef or jpg) at whole pic, 50% or 100% - full screen or half with thumbnails above and includes Picture Control & EV correction for things needing only a quick tweak & as previously high compression for e-mail quickies.

All free , but if anyone can tell me how this compares with Aperture at the first sort stage, I would be interested.