The Unofficial Apple Weblog runs down 10 ways to use Quick Look in Leopard, including one we hadn’t tried before for browsing fonts:
Open a Finder window, select Cover Flow view and navigate to the font you’re interested in. Click the space bar and presto! Instant preview.
In fact, the Quick Look font preview is better than the Cover Flow view, because it displays the entire alphabet, not just two letters. Other Quick Look tricks include previewing the contents of ZIP archives, folders, and the Trash.