Extremely slow Wifi on iPhone 3GS

Since upgrading from the iPhone 3G to a 3GS I've come to realise that the wifi performance is very poor compared to earlier models.
I am talking about measured speed, rather than signal performance, for signal performance the 3GS actually seems slightly better than my 3G - eg it will connect to a base station from further away than the 3G, but when both are in range the 3GS is MUCH slower.
Using the speedtest.net app on a 16Mbit ADSL2+ connection (which gives a measured performance of 14.5Mbit on a Macbook pro on the SAME wifi network) I get the following results:
iPod Touch 1st Gen:
Download: 7448 kbps
Upload: 923 kbps
iPhone 3G:
Download: 5938 kbps
Upload: 859 kbps
iPhone 3GS:
Download: 1029 kbps
Upload: 316 kbps
Clearly a big descrepancy here, with the iPod Touch almost 6 times faster in throughput, and the iPhone 3G not far behind.
This is on an 802.11g network using a netgear router and WPA-PSK, but I have also tried an Airport Express with no significant change.
Is anyone else noticing this problem ?
Regards,
Simon

No, it's definately connected to wifi, besides, I'm not on AT&T as I'm not in the USA
I've tested it in airplane mode as well to be sure it really is connecting by wifi.
The way I see it, it's either a hardware fault in my specific phone, or a driver/firmware issue in the 3GS - one of the things that changed from the 3G to the 3GS is that there is a different wifi chipset, and it may be that the drivers are still immature.
Waiting patiently on 3.1....
Regards,
Simon

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