bubble.up.soda

hi all --

I'd like to have a real time visualization of all the visitors on my website. That is, a list of all the people currently on each page, updated in real time.

Does anyone have an approach they could share? I'm curious what technologies people find useful for this kind of thing.

Also, if you don't mind, if you were to code something like this, how many hours do you think it would take?

Regards