iPhone 3G WiFi issues
Wondering if perhaps WPA2 Enterprise has issues, I dropped back to WPA2 Personal, but it behaves the same way, so that doesn't appear to be an issue.
One other strange thing is that the "Remote" app can find my local AppleTV, even when Safari seems unable to get to the Internet.
Perhaps the iPhone is getting confused with what it's default gateway should be? I'm saying this because I ran a packet capture on my router (pfSense) and didn't see even a DNS request from the iPhone when I attempted (and failed) to surf to a website.
iMac & iPhone 3G, Mac OS X (10.5.4)