I was checking weather there is a way to set the mp3 of your choice as your ringtone or notification tone. For example, the calender notifications in galaxy tab with android 2.2 has only short ring tones. I wanted to set one of my mp3 songs as notification ringtone.
To do this, go to the my files app and browse to the song / tone of your choice. Using the menu options you can select copy. On the top of the screen you will see an arrow which will take you up in the folder hierarchy. Continue till you reach the root. Then browse to media»audio»notifications. Again use the options to paste it in the notification folder.
You are all set. Now go to any calender event and go to settings where you can change the ringtone. If you followed all the instructions above, then you will find the song you just copied in the ringtone list.