I found a site that will run tests on various Internet ports to see if your ISP is slowing down your connection speeds. This is called traffic shaping. For example they may slow down your speed if you are watching a flash video (ie YouTube) or slow down your downloads.

Glasnost tests enable you to check whether traffic from your applications is being rate-limited (i.e., throttled) or blocked. There are several tests listed: Glasnost: Test if your ISP is shaping your traffic