quoth deusx: '"Recent system:has:shortcut Bookmarks" Still one of my favorite hidden Delicious features, partially because I wrote a version of it. Essentially a server-side rendition of Firefox's keyword shortcuts. Bookmark something tagged shortcut:foo, include a %s placeholder in the URL, then search for "!foo bar" and be redirected to the bookmarked URL with %s replaced by "bar". Good for search engine URLs and other command-line-esque URLs. It becomes especially handy if you have Delicious search installed in your search bar. This particular bookmark shows other bookmarks tagged with the shortcut: convention'

Front Row ships with a bunch of undocumented keyboard shortcuts, here's a listing of (known) commands.