All of us who live overseas have to contend with interesting Internet connections. Those may range from "all you can eat," mega-fast broadband connections in western Europe to periodic satellite pings for a friend of mine in West Africa. Some packages have transfer limits imposed by the provider. Hit your limit and your service gets interrupted just before you send off that monthly report. How can you tell when you're close to reaching your limit? How can you tell what kind of download speed you're really getting, as opposed to the one advertised in the local language of your choice.
BitMeter is a little application that will track both your connection speed and your data consumption over hours, days and months. It will help you verify your up/download speeds AND monitor your transfer limits.
It's a free, handy tool for keeping track of your usage.