A couple of interesting options, made possible by the Tablet PC features included in Windows 7. You don’t need a Tablet PC to use these features, just a tablet like one of Wacom’s fine products.
Those options being Sticky Notes and Windows Journal. Neither are recommended for serious artwork but are fine for doodling.
Sticky Notes is a little tricky to use, albeit simplistic. You can’t change the pen colors, there’s no undo function, and the eraser erases whole strokes, but you have to touch the actual stroke to erase it, making it sometimes a pain to erase a small dot. All you have is a black pen. On the plus side your note “window” has almost no clutter in the way of toolbars and menus. Also, there’s no popup asking you to save if you close a note. It just disappears, forever, which is fine if all you’re doing is throwaway scribbles. The only way to export a doodle from Sticky Notes is to do a screen capture.
But it’s because of the minimal amount of toolbar/menu business that it works well in a small window. On a widescreen monitor you can have a YouTube video going and still have a good bit of space off to the right to fill with a sticky note.
Windows Journal has a more proper interface with a set of menu and tool bars. That means the window takes up more screen space than Sticky Notes for documents of equal size. However, you can save your documents, set up templates, export to TIF format, print, and have some control over pen size and color.


