Today kneeling – especially on a bare floor – has fallen into disuse. So much so that Benedict XVI's desire to give communion to the faithful on the tongue, and kneeling, is cause for amazement.
Kneeling for communion is one of the innovations that pope Joseph Ratzinger has introduced when he celebrates the Eucharist.
But rather than an innovation, this is a return to tradition. The others are placing the crucifix at the center of the altar, "so that at the Mass we are all looking at Christ, and not at each other," and the frequent use of Latin "to emphasize the universality of the faith and the continuity of the Church."
Here in America many diocesan parishioners are still under the impression that since standing is now the "norm" that kneeling to receive communion has been forbidden. This is simply a misunderstanding. Redemptionis Sacramentum says the following:
[90.] "The faithful should receive Communion kneeling or standing, as the Conference of Bishops will have determined", with its acts having received the recognitio of the Apostolic See. "However, if they receive Communion standing, it is recommended that they give due reverence before the reception of the Sacrament, as set forth in the same norms".
[91.] In distributing Holy Communion it is to be remembered that "sacred ministers may not deny the sacraments to those who seek them in a reasonable manner, are rightly disposed, and are not prohibited by law from receiving them". Hence any baptized Catholic who is not prevented by law must be admitted to Holy Communion. Therefore, it is not licit to deny Holy Communion to any of Christ’s faithful solely on the grounds, for example, that the person wishes to receive the Eucharist kneeling or standing.
Now... this all assumes that the communicant approaches his Lord with a heart of reverence.
Other links of interest:
-In the USA is it against the law to kneel for Communion?
-Conflict with priest over receiving Communion kneeling
-Overcome idolatry in life by kneeling at during Mass
-Bishop says Catholics should kneel, receive communion on tongue