Ok, let's be much more specific then.

We have a new list aimed at users who are known to be less than stellar with technology. We want to see how many are actually using the web interface, as opposed to email, to access the list. If we can get an idea how many are actually using the web interface it can give us some clues as to how best to further market the list amongst this group. Hence, the question 'how many users are using the web interface?'.

Thanks for your help, it is appreciated.

Cheers
Michael