I combined the "Enhanced" Visitors Counter (3277) and the Number Of Visitors Online (1367) contributions.
The default visitor counter is not a real visitor counter, cause every time the footer is reloaded it counts 1 new "visitor", wich it is not.
With this change it checks if the current user is known in whos_online. If so, nothing changes. If not, the counter is added with 1.
This small Online Visitors change let's you see how many visitors are online. It is shown on every page of the shop in the footer as: "On-line visitors 3" which obviously means: number of visitors is 3.
The Online Visitors was not multilingual, I changed that.
I hope someone find use in this combination, I know I did ;-)