-Nexus 7 Launcher
-Wi-FI
-Gps
-Microphone
-Bluetooth
-Google Now(With the new jelly bean voice search)
-Pen(With Scribble) (Use Quill)
-Audio
-All apps are tablet optimized (For example when in the play store if you turn it on landscape it will look exatly like on honeycomb)
-Youtube(HQ does not work. Disable HQ or HD and it works fine)
-G-Sensor
-SD Card Storage(After boot you need to remove the SD card and insert it again to work)
-Internal storage
-Camera
-Fling(Thanks to iamchucky)
-The smoothness of Project Butter