I've always used DSL Reports (http://www.dslreports.com/stest) for my tests and 2wire (http://www.2wire.com) for bandwidth testing... lets see what I get on your link:

7.1 megabits per second
Communications 7.1 megabits per second
Storage 871.8 kilobytes per second
1MB file download 1.2 seconds
Subjective rating Awesome
Mmm... for Comcast home cable, I'm impressed... although I think the results are a tad bit off. =\