Posted by Matthew Elshaw at 4:39 AM GMT
An excellent introduction to perhaps one of the most commonly used black-hat techniques. Hidden text can go a long way to banning your page from search engines. If you want to read more information on some common black hat techniques there is an article available on the W3Edge website. The article refers to SEO Spam and is quite an easy and informative read.
Black hat SEO indeed. Its better not to delve into than compromising your sites.