Here is a short screencast that I did about using TiddlyWiki as a bookmark manager. Tiddlywiki is a non-linear notebook that is free for download that works especially well using a Firefox and an add-on called Tiddlyfox. Tiddly fox allows you to save the file through the browser. It's a small, lightweight tool that you can take it with you or store it online.
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So, what do you think? Did I miss anything? Is any part unclear?