I installed a new Firefox extension a few days ago called QuickNote. It’s an awesome extension that I am primarily using as a blogging aid. What is QuickNote? In QuickNote’s words it’s a:

… note taking-like extension slightly modeled after ‘Post-It’, ‘Sticky’, and the "Quick Notepad" plugin for jedit.

I
didn’t really get that either, but I did installed it, so I could kick
the tires.

In Firefox QuickNotes creates a custom sidebar or new
window (user selectable), accessible by hitting cntrl-F7, that displays up
to four savable, QuickNote-specific tabs in
which you can jot down notes. Installing QuickNotes also adds a "Send to QuickNote" link in the
context menu (aka, the right mouse button click menu). Clicking on this
link will send any text to QuickNotes. Some screenshots of QuickNote can be found here, and I’ve added QuickNotes to my list of installed extensions.