I am rooted, desire rom, no hacks to trick the 3g instead of WiFi icon.
now that its out of the way I tested my home WiFi with the same site and I get anywhere between 3 and 6 mb/s (i have clearwire). I also downloaded the speedtest app but it shows my location in DC. Im in chicago. So that's weird. In no way I'm bragging about my downlink speeds as I'm not even sure if this accurate myself. But my WiFi test was spot on so take it as you please
Tried that site on the wi-fi network here at the community college I work at (which has a 150 Megabit ORCA connection) and got 1815 kbps - which is about 1.8 mbps? Mind you its mid day and all the students are busy thrashing it.