So now that I've made this discovery, it's time to exploit it. ^_^ It looks like TimeWarner just opens up unlimited bandwidth to the servers being used for testing. To test this, I monitored my internet bandwidth at my IPCop firewall and conducted a ping flood to the speed test site using 4428 byte packets. 1456337 packets later...
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Current Out: 4.392MBps
That's 35.136 Mbps of upload bandwidth being used. XD Hopefully TimeWarner doesn't get pissed, but if they do, it's their own fault.
Now, to find a way to unleash this bandwidth for my regular internet traffic...