As you know, there is evidence that Penguin takes a harsh look at your anchor text ratios and will penalise a site for spam if you have an unnatural anchor text ratio in your link profile. We have begun to combat this by place generic anchors in our link profile. "click here,more info" etc etc This will be obvious for some, but not for others. Google has spies in these forums, they check what we are doing next in order to hammer our next tactic. The current generic anchor text technique is like a giant whack-a-mole ready to be hammered by Google. So my advice to you guys is to stop building masses of generic anchor texts and instead begin looking at every inner page you have and pump backlinks into these pages with anchor text which is loosely connected to that specific page. It looks more natural and still diversifys your anchor text. Build backlinks with no anchor text to the homepage. Build backlinks to the inner pages with anchor text that does NOT include your main homepage keywords but is related to the page. Google is just ready and waiting to hammer sites with lots of unrelated anchors. We need to acheive a nice balance, so stay relevant to the page, not the site. My last piece of advice, go for quality not quantity. Instead of building thousands of links to your site simply create a handful of separate blog networks which feed into the site. Five of these a week and you'll likely never be hit by a penalty as long as you stay under the radar and you can probably use very targeted keywords as it is natural for slow linkbuilding to happen like this.