You can disable a lot of the built in google apps..
Settings->Apps->Selected App->Disable
The apps are still there, look under 'All' to see them at the end of the list.
My disabled ones are....
Calendar / Calendar Storage / Chrome / Contacts / Contacts Storage / Email / Exchange Services / Gmail / Googple Play Games / Google Play Music / Google Search / Google Text-to-Speech Engine / Google+ / Hangouts / Maps / YouTube
If you want a different sound signature (I dislike the 'enchancements'), try disabling the 'Sound Enchancements' you don't get access to the equalizer etc, but I prefer the sound.
Just remember to enable the apps again, you may have to reboot your ZX1, certainly to get the 'sound enhancements' back.
Also set the timeout on the screen as low as possible, turn on airplane mode, that's made a huge difference to my battery.
Another thing that helped for me was removing the widgets from the home screens, and obviously setting the screen brightness to the lowest level, which may not work for everyone.