Here's something, hopefully it'll help: If you have a friend w/another Mac & a Firewire cord, hook up your Macs via the Firewire cord, boot up your friend's Mac, then yours, but hold down the "T" key. This will make your MacBook a hard drive that you can access with your friend's Mac.
If you want to move your stuff to the external HDD, just plug it into the USB on your friend's Mac.
After you move everything, you can easily wipe your MacBook HDD with the Leopard install disks.
Hopefully I covered everything. Let me know if it works.
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