Google Algo Update In Que. What consititues over optimization?

[iAnalyst.com]

http://www.pcmag.com/article2/0,2817,2401732,00.asp

According to this, Google is bringing the hammer down soon on another 10-20% of the search results.  While we don't advocate keyword stuffing, exchanging links, or anything too risky I am still concerned.

Do we know if the example "perfectly optimized page"; http://www.seomoz.org/blog/perfecting-keyword-targeting-on-page-optimization  is now going to be penalty bait? Is this over stuffing?

Also, how might this effect ecommerce sites in particular?

[SEODinosaur]

I dont think there is such a thing as "perfect SEO" (or perfect anything), I did a little research on this because it got me a bit nervous... I found this article http://www.webconfs.com/over-optimization-article-8.php... Last time Google was hinting a change to its algo's Panda kicked some sites. I wouldn't underestimate Googles "Hints"...

The article I mentioned explains the differences between overstuffing keywords and keeping it clean. Keeping a keyword to content ratio of 3-7% should keep you in the "safe" SEO area (for now).