From ModMyiFone - Wiki
by: plmars
Hey everyone. After about 3 hours of trying to figure it out here it is. I renamed my applications.
Here is how you do it.
1) Download this file.
2) The file inside is just a regular XML. Modify it to your likings the same way as you would modify DisplayOrder.plist.
3) Upload to /System/Library/CoreServices/SpringBoard.app/English.lproj/
4) Reset your phone.
Fell free to repost this or even create a tutorial but give me some credit when you do.