A common complaint about some Samsung Gingerbread phones is the fact that they mount the relatively small internal sd memory as /mnt/sdcard and this memory is treated as the phone's primary removable storage by some apps, ignoring the "real" removable sd card that Samsung refers to as "/mnt/sdcard/external_sd".
This simple gui allows you to swap the two so your larger "external sd" is mounted as "/mnt/sdcard/" and the smaller sd internal memory is mounted as "/mnt/sdcard/external_sd".
This is done by changing a file called vold.fstab in your phone's /etc folder. The original device vold.fstab file is backed up to /etc/vold.fstab.backup when this app first runs. Your data on /mnt/sdcard and /mnt/sdcard/external_sd is not touched in any way whatsoever. Root is required. Easy install: copy the apk file to your SD card and open with a file manager.
Please nandroid backup before testing!
If you get "Unknown Error, Contact Developer" you are more than likely not properly rooted! This app requires Superuser and Busybox to properly function!
Please note that if you've already moved existing apps to SD or existing apps have placed support files on SD, swapping mount points is not a good idea. Uninstall these apps, then reinstall after swapping.