How many times have you wanted to put a sticky note on a page to remind you of something?  For instance, you could put a sticky note on digg.com so the next time you visit it tells you that you should really be doing something more productive.  =)

The Internote extension for Firefox lets you put sticky notes on any page you visit, and they will be there when you return to the page. Since it's an extension, it won't work across computers, but it's still quite useful.

Here's an example of a sticky note you might want to use:

Once you install the extension, you'll notice the little yellow icon in the status bar. You can also add a bigger icon to the toolbar if you want. Clicking once will give you a new sticky note, and right-clicking will give you the menu where you can get to the manager.

In the Internote manager, you can see the list of all the sticky notes that you've left, and change/export them.

Really a quite useful extension, and it even has a little eye candy… look at the transparency effect:

Download Internote Extension from Mozilla Add-ons