I've also been running sppedtest.net tests on my 3G connection. I'm on the O2 network in Ireland.
The fastest I've gotten is 2719kbps down - 555 kbps up
A more typical number is 1500kbps down - 1000 kbps up

On a different note I seem to be getting reasonably poor results on the wifi connection compared with a laptop using the same wifi access point and connecting to the same speedtest.net server. I run the tests one after the other and I get the following results

Laptop - 10 Mbps down - 1000 kbps up (This is actually the speed of my broadband connection so this is the fastest achievable)
X10 - ~4 Mbps - 1000 kbps up

The upload speed on the phone is the same as the laptop upload speed but the download speed is less than half. I have done this test a number of times and it's always the same result. I'm beginning to wonder if the phones download speed limited.

Has anyone else done any connection tests over wifi.

 

I got around 1200 kbps for both, download/upload...and every time it is the same speed for both, very cool when I am streaming something on qik.com or something...

 

4mbit down 1mbit up for me on Rogers.

 

Average of 3500 mbps upload and 1300 mbps download on Rogers.

Looks like Rogers kicks arse!

 

DSL Reports says 829 kbit/sec down, on Rogers

 

My Wi-Fi tests for DL are far worse than my 3G tests, about half the speed. But the UP speeds are better over WiFi.

Just confirming your test that 3G is faster for me also. It shouldn't be as my WIFI connection is about 6.5M, but 2.22M on the X10.

P.S Australia here.