Speedtest calculates your broadband's connection via your web browser. You simply select a server and it does the rest. While we were happy with what ours found, Daily Buzz Blog used Speedtest to find out their speeds weren't living up to what had been promised. After a few calls to customer service, they were able to get a discount on their services. Speedtest is a great way to keep your ISP in check and see if you're really getting what you paid for.