Of course most of us in the SEO community would have already heard this news last week about how Google changed its webmaster guidelines to include backlinks in Press Releases as unnatural. Now it has been further clarified that both anchor rich and naked links in press releases are considered paid advertisements and should be nofollowed or will be considered unnatural. On another forum someone mentioned: "Google specifically pointed to a press release whilst i was going for a reconsideration request, they had this and one other as an example of bad links i should clean up. It had my web address and one keyword as anchor, so i suppose they were referring to the keyword rich anchor." So even a proper press release which has only 1 keyword rich anchor and 1 naked link can contribute to a penalty!