Kneeling for communion is no longer a common practice for Roman Catholics in the United States. However, I do see it on occasion in our parish and the response by others in the congregation has been a little surprising (i.e. they do not like it). I have been surprised by the response, but it is an accepted practice by the Church and encouraged by Pope Benedict. The Deacons Bench has a good description of the practice just in time for the Triduum.