Speedtest.net
You can choose from among many Internet servers distributed worldwide to run this download / upload speed test. The Speedtest.net service utilizes single large file transfers and is therefore good for measuring total network bandwidth but does not give as much information about network latency effects. It boasts a cool Flash interface for displaying results. Some other popular speed test services on the Internet - like Speakeasy - are based on the Speedtest.net technology.
Dslreports.com
DSL Reports offers multiple speed test services. Their Flash-based application supports standard broadband speed testing while an alternative Java applet promises better accuracy on very high-speed connections. Other tests are designed for mobile phones.
These tests are among the few available that report on latency (in milliseconds) as well as upload / download bandwidth. However, the Flash test in particular may under-report the bandwidth score if your computer has a slow CPU. Be sure to compare these results to another service that does not use a Flash interface.
CNET Bandwidth Meter
CNET Bandwidth Meter is one of the oldest download speed test services on the Internet. Based on the type of connection you specify, the test will download one image file of size between 50 KB and 1.5 MB to calculate download bandwidth. It uses a fixed server location in the U.S. Do not attempt to re-run the test using the browser's Back button as results will be unreliable.
Speakeasy Speed Test
The Speakeasy connection speed test is one of the most popular on the Internet, often praised for its accuracy and its cool interface for displaying results.
AuditMyPC.com Internet Speed Test
Another great Internet speed test site is this one hosted at AuditMyPC.com. While there are no multiple server locations to choose from, the results are very easy to read and have been fairly accurate based in my tests.
Like most other bandwidth speed test sites available, this site tests both download bandwidth and upload bandwidth.
InternetFrog
A java based internet speed checker where download and upload speed is calculated. How fast or how slow the connection can be easily identified by a speed graphic ranging from 14.4 modem(14.4 kbps) to T4 lines (274 Mbps).
speed.io
Bandwidth tester with a very cool user interface
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