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While making changes to their algorithm, Google added new penalties for certain SEO tricks that used to be very effective. No longer can you create back links with just one anchor text. If Google sees a bunch of links to your site using the same anchor text, you are sure to receive some type of penalty. Your anchor text needs to look natural in the eyes of Google which is why you need to diversify the terms you use for your anchor text. Do not be afraid to mix in terms like “click here” or “visit now” as this is how non-SEO Internet users would link to your site on the web.
Although I disagree on using terms "click here" or "visit now" within SEO related links because, and as far as I have found, this is still a key method and part of your links description which is what makes the link interesting. This rule not applying to links which are related to a click here or vist now topic of course.