You can check the speed of your high speed internet by clicking on your internet preferences. Once you've clicked it, scroll to the internet with which you are connected to. A scroll bar should...
Almost everywhere these days. There are different forms, including Satellite internet, cable internet and DSL internet, all deliver high speed connections.
Lots of companies offer high speed internet in the US (and in other countries). Availability will depend on where you live as different providers cover different areas. There are a number of sites...
There are several such as WiFi, Time Warner internet, and even providers through your cell phone companies. Check your local phone book to see what is available in your area.