Speed Test
The service at Speedtest.net is excellent. The application is really slick and seems to provide reliable results of connection tests. It is a hybrid solution of Flash and Ajax and the UI is quite nice. (Ads are about the only negative aspect of the site, but they pay bills just like us and I appreciate that the service is free.)
If you are into speed or need a solid way to make sure your ISP is giving you what you pay for, hit Speedtest.net.
Here are some results from my latest speed test:
[tags]speed, test, bandwidth, connection, Internet, Flash, Ajax, speedtest.net[/tags]

Blake
2007-11-26 0232hrs
I tried it out. Here are my results:
Blake’s Speed Test
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Luca
2008-03-04 1212hrs
It’s sad for me to see those numbers…
I’m usually under 1800 kbps. Download. :(
Upload is ~400 for me…