1) I like using TouchPal, a slide keyboard to replace the standard keyboard.
2) I like using Activator. One of the things I used it for is to start/stop/skip/repeat music from anywhere, even without having to turn on the device. I don't use the in-line control of the headset to do this because I play my music through proper speakers via bluetooth, and listening to music is my routine just before going to sleep. I like to be able to perform those functions without opening my eye.
3) I like to be able to download youtube musics and adding it to my iPod player without using the PC.