1. Branding – Add your logo to the top left
2. Left Nav – Add a visual feel for Client and Server – I used the outlook logo to convey it. You could show that image as you hover over it
3. The top text could be removed “Provide a name and description…” … as doesn’t add heaps of value
4. Preview needed – On the bottom right, would love a preview of the signature. Then you could click on it to edit. I think this would be more intuitive than clicking on the ‘design’ menu item.

SSW has a rule Do you use great email signatures? and a video about signatures and CodeTwo.