Also - as my work internet is so slow and I can't fully view the links above...
If any of them have the "metal cup" type lifting point which seems ideally designed to do as much damage to your jacking points as possible, simply buy an ice hockey puck (which is made out of very firm rubber) and cut the bottom half of it to fit the "cup" part of the jack (I cut mine as an octagon of the right size) and hey presto, no damage to the underside of the car!