Saving memory (gigs) on your iphone?

I'm still running itunes 10.6.3 and have not upgraded to ios 6

I have a 64 gig 4s and am upgrading to a 32 gig iphone5
How can I cut down on my iphone gig space consumption?
my question is about my iphone data summary while syncing
at the moment I have - 57.42 gigs of used space
25.8 audio
4.7 photos
11.5 apps
13.3 other
2.4 of free space
I can cut down on audio by subtracting some music or getting icloud
I intend to upload my photos to a new mac using iphoto
drop a few apps.
but what the hell is the 13.3 gigs of "other" stuff used?
I do use voice memo for concerts and school lectures but doesn't that fall into audio music? Can anyone give me insite to what this other stuff is and how can I cut down on it? I do have a few notes and docs in pages but that shouldn't take up 13 gigs. Also I do not have any movies on my device

any insight it helpful

Delete some of everything, music you don't listen to, photos you don't look at, apps you don't play.