Xcode 4.1 stuck trying to load debug symbols from iPhone 3G
In case anybody is still interested, this issue changed slightly with Xcode 4.2, and I posted an updated question here: 
https://stackoverflow.com/questions/7922308/xcode-4-2-error-0xc002-when-trying-to-use-a-jailbroken-iphone-3g-for-developmen