Recently I installed CyanogenMod 9 on my mobile. Everything went smooth and I'm happily running a new operating system.
Just that I cold not install Google Maps - could not find it in Google's Play Store.
The solution is easy: open the browser on your mobile and surf to the App Store, more exactly you can follow the direct link to Google Maps:
If you are logged in with your Google account, you can install the software from this link. Just hit "Install" and after a short while your mobile will start the installation.