Google has pushed out a refresh now at version 3.8 to the Panda algorithm recently on June 25 - that noticeably affects "only ~1% of queries worldwide," Google said in a tweet.
Here is the tweet:
Heads up: we're pushing a new Panda data refresh that noticeably affects only ~1% of queries worldwide. More context: goo.gl/HNvCt— A Googler (@google) June 25, 2012
Also, at the recently held SMX Advanced, Danny Sullivan asked Google's Matt Cutts about nofollowing affiliate links. Cutts said,
"We handle the vast majority of affiliate stuff correctly because if it is a large enough affiliate network we know about it and we handle it on our side. Even though we handle I believe the vast majority of affiliate links appropriately if you are at all worried about it, I would go ahead and just add the nofollow because you might be earning money from that."
Watch the video: