The folks at Wired.com are compiling an iPhone 3G performace map and are asking iPhone users to participate.
IPhone 3G network performance issues aren't isolated to the United States, and the time has come to collect global data. IPhone 3G owners from around the world: Wired.com needs your help. We've created an interactive ZeeMap, and we'd like you to report your iPhone 3G's 3G and EDGE download and upload speeds. We promise it's easy, and assuming your connections aren't grindingly slow, this should only take you about five minutes.
So, if you have 5 minutes, you can submit your speeds.