I would advise against that. You don't want to mess up any programs that depend on the library being in /usr/local/lib . Your best bet for the simple solution is to create a symbolic link in /usr/lib , that way you don't break anything in the process.
Originally Posted by Skatox
However, realistically, you should reinstall libgpod and gtkpod to ensure a proper installation. The deb files I have created (below) should be able to replace your current installation and they "should" work (no guarantees). I recommend giving that a try, and please let me know if that doesn't work, I will try my best to fix the debs so that they will work.
sudo ln -s /usr/local/lib/libgpod.so.0 /usr/lib/libgpod.so.0