This app can flash a kernel within android on Samsung i9000, Captivate, Fascinate, Vibrant and more.
* backup kernel as update.zip (for recovery)
* flash kernel from zImage, any .tar or .zip that contains a zImage
backup kernel: creates an update.zip (for recovery) containing a backup of the current kernel with time and date in /sdcard/sgs-kernel-flasher/backup/
choose kernel: choose kernel image (mostly named zImage) or any .tar or .zip that contains a zImage
flash kernel: flashes the kernel
reboot: reboot the phone
Android market: SGS kernel flasher
The author of this app is not responsible for any damage to your phone that may be caused by usage of this app or by deficient kernel images.