What is using up all of my iPod's space?

i know see lots of questions why there's space being used "other" on macs, can explain this?!


see, have 8gb ipod touch (4th generation), , i'm noticing large amount of space on "other" taking 2gb! considering ios 5 weighs down hdd around 7.something gb on ios 4 way down having 6.35gb of space, i'm tight on space! after restores other prominent! what "other" on ipod, , how rid of it?

 

jailbroken?

 

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