I know many people know about this. This is for the people who don't. If you want blank icons on 3.0 jailbreak 2.2.1 and add as many blank icons as you want and then backup. For numeric battery download bossprefs or sbsettings and choose the numeric battery. Backup you iPod Touch or iPhone just incase they don't carry over to 3.0. When the update is finished you should have a numeric battery and blank icons. If you don't then restore from the backup and it will work.