(Above is a screenshot of the app's UI for XP......each icon works as tools to mod your iphone.)
It's called iPhone PC Suite ! 
Forget about iTunes.......This beats iTunes !!
The Most complete application on XP for everything iPhone...!!!
Description:
Download & Upload pics to and from PC and iPhone for......
Camera Roll- works 100% (upload / download)
Calendar- works 100% (upload / download)
Contacts- works, has some language translating issues (upload / download)
SMS- works mostly....
Photos- works 100% all in FULL RESOLUTION !!!! (upload / download)
Notes- works 100% (upload / download)
eBook- works 100% (upload / download)
Call log- works 100% (upload / download)
SMS Chat- works 100%, send SMS to someone from PC through iPhone
Safari, bookmark management, works 100% (upload / download)
Apps- **Keep using "Installer" in your iPhone.**
the ones in this app are very buggy and some are PXL.
Finder- works 100%, very useful (upload / download)
Backup/Restore- works 100%, a MUST....
Sound Themes- works... (upload / download)
Ringtones- works 100%, they wont get deleted when synced with itunes !!! and the app converts them automatically...!!
SMB Themes- works 100%
iPod Music Player
- create/delete/rename playlists. works 100%
- copy music to/from iPhone/PC works 100%, drag/drop with your mouse!!
- copy movies from PC to iPhone works 100%, drag/drop with your mouse!!
- while copying movies iPhone PC Suite also does the converting,
- you need to put the video file in a playlist for iPhone's iPod to "see" it...
you can even install and preview SummerBoard themes on the iphone...!!
Download:
http://www.free-codecs.com/iPhone_PC_Suite_download.htm
Don't forget to update iPhone PC Suite after installation...