yes you can store both your music and your pictures and videos taken with the camera on the SD card. As far as other uses for the card, in general, 3rd party apps can only write to their own directory, not directories created by other apps.
I believe you are giving out the right information and like to tell you, basically am a heavy game user, and just want all my games to be able to save to SD card. (Eg: Real Racing 3, NFS series, GTA). Any idea if games like I mentioned can be transferred to SD. Also if yes, can they be updated ?
Maybe you can also DL one game from above and leme know... Thx