Yesterday, I was scheduled to take DL 1087 to Atlanta from Columbia Metro on a 737-200 (N311DL). We departed from the gate as usual, but when we began to taxi the aircraft began to shake a lot more than usual, so the pilot stopped the aircraft, and later pulled off the main taxiway so that other aircraft could pass. At first he said that the aircraft was drifting to the right, so they suspected a problem with one of the tires. To make a long story short...2 hours later I was rebooked on USAirways for my flights, and at the time I left CAE (5:40) the 737 was still being repaired. The last announcement I heard was that the nose gear axel appeared to be bent...they attempted to repair it, and took the aircraft on a test-run with no success. Does anybody have any more information about the aircraft or what caused the incident?