ouch! Back pain has to be the worst thing because it effects your whole body. I hope you get better soon.
My brother once broke his back in several places when he fell down a cliff (and his ribs, his arm, elbow etc.) and after a month of rest and recouperation in hosptial, he was back home, mowing lawns and jogging again... and about 8 or 9 years later, he's fine... so have hope that you'll make a full recovery
Swimming is great non-weight bearing exercise that might be a good alternative to walking/jogging next week -- but check with your doc first.
All the best for a speedy recovery.
Just keep moving! And don't be lazy...
SW: 74.3kg - 1/1/09
CW: 71.1kg - 3/5/09