Mr_Prospector - 5:00 am on Mar 28, 2012 (gmt 0)
A couple of years ago I had access to many high PR websites that weren't owned by me. I used them several years ago to place links to my sites. The links were on quality content, high PR, on topic pages. The other day I got the un-natural linking to manipulate PR email from Google. It definitely appears to me that you can damage somebody else's site by linking to it excessively.