Here's Peter Brimelow's take on that subject:
"Peter Brimelow (a once-respected conservative voice) on Goldberg of National Review (a once-conservative, now respected, magazine)," Vdare.com, March 1, 2002
While reading Brimelow's piece, don't forget to check out the links to the Steve Sailer and Paul Gottfried articles as well.
I also think that VDare did the movement a disservice with the ad hominem attacks on Jonah Goldberg. I had lunch with him after the YAF conference last summer. He actually agreed that the importation of large number of people from foreign cultures and polities undermined our common culture and was driving the American polity to the left.
Then Paul Gottfried (a nice enough person with which to correspond by e-mail) started a series hitting Jonah on immigration. This had the effect of angering Jonah and making sure that he would not change positions.