I just downloaded the iNetwork Test app for the iPhone ($0.99). As it’s name suggests, the app tests the speed of your connection. Right now I’m getting 1331.525 kbps on Wi-Fi.
3G speed inside the AT&T store in the Santa Rosa Plaza Mall, 941.555 kbps
Wi-Fi inside the Apple Store, Santa Rosa Plaza Mall, screaming fast! 4251.702 kbps