AlyssaS - 8:18 pm on Feb 25, 2011 (gmt 0)
walkman - easiest way to check is on Quantcast.
accociated content had 892k unique US visitors on 22/02/11 and 538k US uniques on 24/02/11 - a drop of 39.7%
hubpages went from 874k unique US hits on 21/02/11 to 467k unique US hits on 24/02/11 - a drop of 46.7%
squidoo went from 469k unique us hits on 21/02/11 to 400k unique us hits on 24/02/11 - a drop of 14.7%
ezinearticles and buzzle are not on quantcast, so they just show estimates (which probably don't take account of the algo change)
mahalo have opted to hide their figures.