I use iFunBox a lot. This is a very useful utility for jailbreaked iPhones. Recently it was updated to version 0.7.224.86. Here is a download link.
1. Thumbnail view supported for wallpapers, camera and all other folders.
2. Support Symlink for the filesystem of firmware 2.0. All .app can be listed in Application folder.
3. Downloading music and movie from iPhone with filename encoded with album name and artist name.
4. Support E-Books, converting plain text to UTF-16 automatically.
5. Support Book Shelf, converting plain text to UTF-8 automatically.
Uploading music and movie to iPhone is now disabled on devices with firmware 2.x.