I just recently got a Galaxy Nexus... any tips, recommended apps, neat things I can do with it?

Hi folks! I just recently got the Samsung Galaxy Nexus with Android 4.0 on it. Enjoying it so far, having played around a bit with some custom ringtones and some emulation.

I'm looking now for tips and tricks. Apps I may not have thought of that you would recommend or consider "essential," things that might help me get better performance out of the device, other neat things I can do with it, etc.