Update: You shouldn't need this patched version if you're running Xcode 4.1 or above. See this post for more information on troubleshooting Xcode 4.1.
iOS crash report symbolication is broken in Xcode 4.0 with archived builds. Read more at http://twobitlabs.com/blog/2011/04/cant-symbolicate-xcode4-archive-builds/
To fix your iOS crash report symbolication, move /usr/local/bin/symbolicatecrash aside and copy in the version in this repo.
Filed as rdar://problem/9241304