No doubt that Firefox 3 and the new places query syntax is going to lead into a lot of new and creative ways of managing the bookmarks saved on your machine.  For those unsure what these are they would be your “Recently Bookmarked” or “Recent Tags” selections you see in your bookmarks menu now with Mozilla’s newest browser.
You can think of them as commands for how you wish to pull up your bookmarks.
When creating one, you do it the [...]

Over at CyberNet they have posted a great guide on how to create your own smart bookmarks. Smart bookmarks are the new feature to Firefox 3 that allow you to bring up your saved links in new, unique and useful ways. For example, you could browse through your most recently bookmarked links, your most recently visited links, and so on.
Check out Create Your Own Smart Bookmarks in Firefox 3!