Gnome Screen Ruler 0.8

Gnome Screen Ruler project is a customizable screen ruler for Gnome.
Gnome Screen Ruler is an on-screen ruler for measuring horizontal and vertical distances in any application. Rulers can be moved and resized using the keyboard.
Main features:
- Horizontal and vertical display
- Multiple units: pixels, inches, centimeters, picas, points, percentage
- Configurable colors and font
- Can be set always-on-top of your application windows
- Can be moved and resized with mouse or keyboard
- Measurement lines track mouse cursor to help measure anything on screen
- Its Free Software released under the GPL
Enhancements:
- Rewrite in Ruby (from C).
- Middle-click now rotates around the mouse position, not the upper-left corner.
- Ruler now shows a left-click target for the popup menu while mouse is over the ruler.
- Unit selection (inches, picas, etc.) moved to popup menu (from preferences dialog).
- Keyboard keys 1-6 now change unit.
- Now uses Cairo for rendering (from GDK).