How to organize your browser bookmarks and favorites

How many bookmarks and favorites are on your computer? I have more than 1,000 in Firefox and Del.icio.us, and even though they’re neatly organized in folders and tagged, I can’t remember what I liked about most of them.
How many bookmarks is too many? Are all those sites still live? Are you really ever going back there?
Happily, there’s lots of free software for PC and Mac that will help you organize your bookmarks.
For the PC
** Bookmark Buddy
This bookmark manager offers four different ways to retrieve bookmarks, site login management, privacy functions and bookmark checking.
** AM-Deadlink works with Firefox and Internet Explorer.
For the Mac
** WebNote Happy does web site tagging and annotating for Mac OS X that helps you organize, bookmark, and make notes about the web pages that matter to you.
** Bookdog lets you Click ‘Analyze’ to find duplicates and then fix them.
Got any others?