Many Internet users are using internet with their monthly limits of download and still they have no clue how to be sure about their calculations for surfing, openning emails, ownloading pictures, videos and etc. One of the Australian internet providers has recently created a table for you to enetr the number of different activities that you do monthly, so you can estimately guess about how much of your limit you can use. Go to this LINK and set the "Calculate my usage for" on "month" and then enter the number of times you do each certain activity.
Finally click on "Estimate" and there you go!
It is very important for some of us to know the limit we have exactly and to be sure what to do and what not do over the net, so we can survive the whole month with our download limitations.