Problems with WiFi network connectivity post 2.1 upgrade

Have been having problems with WiFi connectivity since installing the 2.1 upgrade. When attempting to view some websites I get a "Safari cannot open the page because it is not connected to the internet" message. The same addresses can be resolved from my iMac at the the same time. Other websites don't have problems. Funnily enough www.apple.com is one of the effected sites.
I can also only sporadically gain access to the App store & the iTunes store from the device. I mostly get a message stating - "Cannot connect to iTunes store".
I am connecting through a WPA encrypted access point. I have tried restoring the device, resetting network settings, etc.
Has anyone else experienced this? After work tonight I will temporarily set my access point to WEP, just to see if the problem may be related to WPA. I have read that the iPod touch is effected by this.
Thanks,
Matt

No problem. The iPhone uses lower power on the WiFi transceiver to save the battery. It won't have the 50 meter range that one might see for other devices. As long as it works reliably when it is closer to the access point it is working normally.

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