If you want to know if your ISP blocks or throttles applications you are running, you can now use a new open source Google tool called Measurement Labs that is designed to tell you if your connection is throttled by your ISP via various diagnostic measurements. ISPs have been accused of blocking connections to various applications including BitTorrent and giving very slow connection speeds in hopes users will back off from the increased download usage, bringing ethical questions concerning net neutrality. ISPs maintain they are in no way capping or restricting any part of the internet or any application. See other Google Internet Tools here.