A while backed, I blogged about how you can use del.icio.us to manage your workflow.
I recently discovered Firefox's Live Bookmarks feature, which allows you to create a set of bookmarks from an RSS feed.
del.icio.us allows you to get an RSS feed for any combination of tags.
Are you thinking what I am thinking?
I created a Live Bookmark called "Reading List" and pointed it at http://del.icio.us/rss/johndunne/toread
I wish my defect tracking system had an RSS interface. I would love to be able to get a set of bookmarks to all issues assigned to me.