If you have a lot of bookmarks in Safari, you might find it useful to search them for certain keywords.
The solution is quite simple. Just open your bookmarks window, then press Command-F and type your search into the text field. Type Command-G to search for more instances of the same word. Safari will highlight the folder, in which the bookmark is contained as well as the bookmark itself. Nifty!
[Editor's note: Yes, "Search" is on the menus and we generally don't publish menu hints, but two things make this hint worth publishing. First, you may not have realized that the search menu works on the bookmarks folder. Second, and the most useful to me personally, is that it works on a folder by folder basis, which means you can click once on History and use search to find that site regarding "tech toys" that you visited who knows how long ago...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030129060603685