Re the footage linked to by
Capn Bloggs of the 146 having a heavy landing:
The footage is real and is of a Crossair RJ100 landing on runway 28 at London City.
A whole thread, including photos of the damage and press reports covering the repair effort, can be found here:
http://www.pprune.org/forums/showthread.php?t=289698
The aircraft was badly damaged but was repaired and flown out about 4 months later.