We've previously explained why you should ditch your extensions for bookmarklets when you can to save on browser bloat. Whether or not you've taken your bookmarklets that far, the Bookmarklet Directory is a one stop directory of both new and popular bookmarklets worth checking out.
You can find a bookmarklet by using the search field or—if you don't know what you're looking for—browse Bookmarklet Directory's highest rated, newest, and most popular list on the site's homepage. Among today's offerings is FontFriend, which lets you check how different fonts look on your screen without you having to hit refresh and Count, which is a bookmarklet for counting characters, lines, and words on a web page.
You can access any bookmarklet without registering, but you do have to sign up to comment, rate or add your own. The site promises to "to index every bookmarklet online," though it bears saying that they're a ways away from that goal.