You can activate Quick Look with multiple documents chosen in your Finder. The Quick Look window will open with the document chosen first, but you can navigate through all of the selected items with the with the left and right arrow keys. Especially useful is the index sheet, accessible in Quick Look's toolbar, which displays thumbnails of all selected documents. This is most handy when looking at pictures, but also serves well with other file types. It works well with all the file types supported by Quick Look you have chosen.Also, activating Full Screen mode in Quicklook with only two items selected, and subsequently choosing the grid, is a useful way of looking at non-Quick Look-compatible items' full resolution icons.

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