There are countless ways to sort a list like this. For example, using SEOmoz domain authority (which is largely determined by the number of high-ranking sites that point to a site), the top two sites are:
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http://coaching.uka.org.uk/ with a DA of 70 and 2.2 millions links from 2,200 root domains.
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BrianMac Sports Coach with a DA of 64 and 300K links from 2,500 root domains.
CF has a DA of 36 with links from 208 root domains. Note that DA is logarithmic, so that a DA of 40 is considerably higher than a DA of 30. Google has a DA of 100, and a DA of 70 is quite high. Of course, a site with a DA of 70 does not mean it has better information that a site with DA of 36, but it does have considerably more influence on what people view when browsing.
While not an online speed site per se, I think it’s interesting that www.exrx.net edges out all of these with a DA of 71 and links from 4,500 root domains.
Best,
Christopher