I have all this other taking up all my memory and I don't know how to get rid of it. I need help!
Other indicates data that iTunes doesn't recognize. This can be caused by an interrupted sync or some other data corruption. Sometimes, just adding another song or app can clear up the problem.
Most often, you will need to Restore your iPhone. This explains how: http://support.apple.com/kb/HT1414
Retrieving data ...