Use your jailbroken access to your device's filesystem to edit, copy, and send files in any way you want. It's now a pocket computer, not just a device.
AirBlue Sharing
$4.99
by Eric Day
share files over Bluetooth to many devices
Apple File Conduit "2"
FREE
by Jay Freeman (saurik)
allow full-file system access over USB
Bridge
$1.99
by Jonas Gessner
import media into your iTunes library
iFile
free trial · $4.00
by Carsten Heinelt
browse and modify the entire local filesystem
MobileTerminal
by MobileTerminal
manage your device via command line
Netatalk
access your device via Apple File Sharing
OpenSSH
secure shell for remote access to your device