One of the things I mentioned in my Aperture podcast that I love so much about this app is its plethora of features designed especially to increase efficiency for power users and pro photographers. This tip centers around Aperture's keyboard shortcuts that allow for some very useful navigation and scrolling of the library browser, which is the pane that displays thumbnails of all the images in the currently selected album, project or folder. Instead of just explaining the shortcuts or giving you a screenshot, however, I thought I would go one step further and put together a short demo video of the shortcuts and the browser in action, additionally pointing out the small shuttle control on the right that helps detail just how quickly you're scrolling. It isn't anything fancy, but it should give you an idea of just how cool and actually useful this feature is.
For those who want the actual keyboard shortcuts, they are: J, K and L to scroll up, stop and scroll down, respectively.