http://willmore.eu/software/growlcode/
Growl is a cool tool for Mac OS X that provides notifications when an application needs your attention. If you start using Growl, you will probably find that you become totally dependent on it...
...and then you will be sad that a few of your favourite apps don't support it.
GrowlCode adds Growl support to Apple's Xcode development environment. It provides notifications for:
Build Succeeded
Build Failed
Preprocessing Complete
Compilation Succeeded
Compilation Failed
Disassembly Complete
Clean Complete
从此告别漫长的编译等待, cheers~~