Suggested by..I think Kyrax in the comments of the requesting extensions blog entry, I've finished a simple notepad for Chrome.
It adds a little notebook icon to the toolstrip, click it to open the sticky note.
Clicking it again will save your text and close the sticky note.
If you wish to close the sticky note without saving, use the Quit button on its window. This application is intended to not have a title bar, but Chrome bypasses that option in window.open.. so if you want it to remember the window position, click inside the window (anywhere but the buttons) to drag the window. (Fixed in 1.1)
The icon will show if you have text in there or not.

Here is the download: http://logicplace.com/pc/projects/ch...ky%20Notes.crx

~ UPDATES ~
1.2:
* Updated for Chrome 3.0.195.1. No more inner notes on chrome:// (or about: ) pages.
* Bug Fix: Now deletes Content Script connections when the corresponding tab closes. Should solve the memory issue..
1.1:
* Added preferences! You can set the background (top) and foreground (bottom) colours of the textbox. (It will invert these colours for the window skin).
* Added the option of opening the sticky note inside the window instead of in a new window. This is good for when switching back and forth between windows is too tedious. *cough cheating at memory games cough* Click the note button on the toolstrip to close the internal window and save its contents. I will add save/quit buttons to the internal window later probably.
* You can switch between modes (external or internal) by clicking the middle icon on the toolstrip. means you're using external notes. means you're using internal notes.
* Click the coloured squares on the right of the toolstrip to open the colour selector. You will have a choice between ten pre-set colours or the ability to add your own HTML colour code (#RRGGBB).
* If you have your internal notes open, it will switch tabs/windows as you do. (This includes the dev tools window..^^; )
* Internal notes will NOT work on the new tab page, nor will they work on chrome-extension:// pages. It only works on http:// https:// and chrome:// (including about: ) protocols.
* Internal notes can NOT be placed on top of swf objects, or other objects controlled by plug-ins such as java or o3d (probably).
* There is currently a weird bug in chrome that will sometimes not load content scripts for remembered tabs. So if your internal notes aren't working on a start page, try refreshing the tab.
* Internal notes will not work very well if on duplicate tabs (ie. different tabs with the same url). I don't see this as much of an issue, though I plan to fix it in the next release.
* Resize internal notes by clicking and dragging the appropriate side (<--> or ^|v).
* Added another button to the [external] sticky note to open all URLs in the current selection. I didn't want to figure out how to make links in a textarea clickable, so I just did this instead. If no text is selected, it will use the whole body. And don't worry, it will ignore any text that's not a URL.
* Bug fix: You can now drag the window by the title bar and the window position will be saved. (Yay I found the variable that controls that. )
* Bug fix: Window is now resizable if it wasn't before. To be honest, I don't remember.
* Bug fix: Now with multiple windows open, the different toolstrips will control the same sticky note window instead of individual ones.
* Improvement: OH LOL YOU CAN ACCESS YOUR OPENER'S/WINDOW'S SCOPE DIRECTLY. *facepalm*