jastra - 10:24 pm on Apr 2, 2012 (gmt 0)
I can say that I have a 6-month-old WP blog theme that has done well all along for its primary KWs. The <title> tags and on-page textual KWs were closely coordinated; worked out great. Then I on 29 March I did some on-page additions of those keywords and whack, I'm at -90.
I'm sure it's from adding too many instances of the keywords. The other KWs haven't changed.
Whether this is normal, or due to the Google's latest, I don't know.
I've removed the suspected overkill and am waiting, with a bountiful supply of liquor.