For every 10 mentions of brand names in your links, there should only be one keyword link, according to Lewis. This means you shouldn't be keyword-stuffing your links or other content. If I'm managing Lenovo's website, for instance, I'd include "just say lenovo" and "lenovo site" in my links along with the odd link to my terms, such as "computers and laptops".
3. Keyword-Stuffed Content
Google has been warning against keyword stuffing since the late 1990s, yet websites persist in repeating key terms ad nauseam. If humans can't read a website, Google won't like it, either. Google really targeted keyword stuffing in its Panda update last year; this infographic charts how well it's worked since it was introduced.
4. Link Farm Building
There's a huge difference between link building and link farm building. Link building is asking your nice online neighbors to link to your fantastic site. Link farm building is building up a massive network of links totally unrelated to your site that may or may not come from reputable sources. There's a distinct line, and you'll know if you're doing it wrong. If dubious websites are linking to yours, then try a discreet, "Can you please take me off your website?" email.
How to Tell If Your Website Is Naughty
Lewis recommends plugging your website into a free tool called Majestic SEO, which gives free reports for domains under your control. If you are looking for something more robust, SEOMoz costs $99 a month and up. The reports, which include useful things like anchor text profiles, should tell if your website looks unnatural to Google and if there is a problem.
Where to Go for Help
While you can easily handle small issues that crop up on your website, if there are multiple problems, hire a professional rather than stabbing in the dark yourself. Lewis recommends checking the Search Engine Marketing Professional Organization's (SEMPO) website. Because Cutts is speaking publicly about changes, it indicates they've been in the works at Google for months, so time is of the essence.