HI MarkTC,
To create a dashboard that is visible to the entire org you will need to either create a new solution or create a new dialog in the default solution.
To create a new solution, you will need to go to Settings, then click on Solutions and click on New, there you enter a name for your solution and you will be able to create a dashboard from there that would be visible by all the people.
If you don’t want to create a new solution you can go to Settings then click on Customizations then click on customize the system and you will be able to create a new dashboard on the Default Solution.
I am attaching an image to be more descriptive.
sorry, for some reason the image can't be uploaded right, will try it later if you can't find the opions, let me know.
Regards,
Damian Sinay