CainIV - 2:31 am on Jun 11, 2012 (gmt 0)
Of the 90+% of the websites I have been asked to help de-bunk unnatural link warning penalties, 100% of the owners swore their link profiles were legitimate and above board.
Until we started looking specifically at the links themselves and patterns. Turns out of most that I have evaluated have had some form of manipulated links.
Unnatural linking does not always refer to paid links.
It can also refer to spamming, and manipulation of inbound links via control over software, widgets, themes - you name it.
I personally welcome this type of tool.