./googleearth-bin: symbol lookup error: /usr/lib32/libXi.so: undefined symbol: XESetWireToEventCookie app-emulation/emul-linux-x86-xlibs (/usr/lib32/libXi.so) app-emulation/emul-linux-x86-xlibs-20100409-r1 is the version installed. (I assume it would be the same error on a 32-bit system with libXi-1.3).
Cannot reproduce here. Can you post output of emerge --info and ldd /opt/googleearth/googleearth-bin ? Seems like ( http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=566011 ) the symbol at some point moved from libXi to libX11 so the versions of these libraries have to be both new to ensure you have the symbol. As far as I can tell the emul package has them right. Could be some old version of the library orphaned on your system, or something.
Sorry, I found I did have some older version of libXi and libX11 in LD_LIBRARY_PATH for some other app that I hadn't noticed before. It's working now. Thanks.