Speed.io

Speed.io is a modern DSL speedtest to analyze your broadband internet access. You find that your internet connection is too slow or you are just curious how fast you are - speed.io is a perfect tool for a fast speed check - worldwide.

speed.io measures your current internet speed to the nearest server (we have almost 50.000 server worldwide). We test your download (speed with which you receive data from internet), upload (speed with which you send data to the internet), connection test (maximal number of connections per minute) as well as ping (response time between your computer and the internet).

All test are performed within your browser over HTTP (TCP) and requires no further software than a newer browser with activated Flash.

http://www.speed.io