I got your link and am using it now. Thanks very much for your quick and helpful reply.
I use OS X and was looking for a native app, the only one I could find was called 'Network Logger Pro'. Unfortunately I had to return it for a refund because I just couldn't get on with the interface, it wasn't designed well at all. Your website is most useful and well laid out, keep up the good work.
I'm curious how you make money, do you sell the data back to ISPs? I'm okay with this I'm just wondering out loud.