BossTool is a free iPhone application that will allow you to move applications to free disk space, jailbreak prep, etc.
To use BossTool just load the app, go the the disk space screen, and you can see your free space on both partitions. The tool currently does not check that the larger partition has enough free space.
Make sure you have at least 100 mb free on the big partition before moving apps! If not, you can delete some music, photos etc to get there. Now, before you move apps, move something like ringtones or wallpapers first.
Make sure that the free disk space increased. If it did not, don't move apps. Something is not working on your phone. If it did, (which it should for everyone), then move the applications next.
Requirements:
· iPhone
NOTE: BossTool can be installed a lot easier if you will use Installer or Cydia to be sure its functions are not crippled in any way. Also, in case you need it, you can find support for BossTool on the developer's website.