Just another point.......I agree with the statement about ground effect, but the aircraft could also appear to "hang" due to the actual flare.
Also, just in case you don't know, the idea of the flare is partially to take away excess speed, and actually stall the wings, so that in a "perfect landing", the wheels will take the weight of the a/c just as the wings stall. You don't need power for this. Physics says that broadly there are two engergy types (well this is simle anyway).Forward momentum....ie given by thrust etc, is Kinetic energy. Your height above the ground is Potential energy. Hence why if you drop something, it gets faster as it falls.........potential energy turns into kinetic. Well in an a/c, when you come in to land, yiou want to slow down, one way of doing this is to get higher, withouit adding any more energy (thrust) from the engines. By pulling the nose back, tha a/c starts to climb, thus 'washing off' (slowing) the speed, as Kinetic energy becomes potential. Since the wing then stalls, and becomes less effective at producing lift with a slower speed, the aircarft does not reall climb, but hangs, and settles onto the runway.
Other effects are obviously the wing stalling, meaning that the aircraft ceases to 'fly', it also takes the weight of the nose gear and a whole host of other good effects.
Hope this helps.....i tried to expalin real simply, and i am sure others will correct anything i get wrong, or will maybe explain a bit better.