How do you track down source of "autoreleased with no pool in place" warnings?

I see this output in my console:

objc[65173]: Object 0x7cdeb420 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[65173]: Object 0x7ced6560 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[65173]: Object 0x7d8e1750 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[65173]: Object 0x7d8e0060 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[65173]: Object 0x7d8deb10 of class __NSCFString autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
objc[65173]: Object 0x7d8dec60 of class __NSCFData autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug

Does anyone have a proven technique for tracking down where I need to wrap the NSObjects in an auto release pool?

Thanks!