Oh one more thing I use a lot it, Read It Later (readitlaterlist.com) Has a firefox plugin as well. Comes in handy when you see a great article, but you need to stay on your current task. It's kinda like a bookmarking tool, but doesn't clutter up your real bookmarks.

and speaking of bookmarks, the Foxmarks plugin for FF is great when you need to work on more than 1 PC.