It's not CWM, but this is the stock 3e recovery + adb root access, allowing you to use adb to back up other partitions, restore, etc. etc.
Flash the pda-recovery-root.tar with Odin using the same instructions as for the Root kernel.
If someone who has not yet rooted could flash this and do the following from adb in recovery after:
adb shell dd if=/dev/block/mmcblk0p8 of=/tmp/stock-kernel.img adb pull /tmp/stock-kernel.img adb shell rm /tmp/stock-kernel.img