I would recommend submitting to high PR and high ALEXA sites, rotate keywords;
20% links in text around your keyword but not on your keyword (for example, "When I need business cards, I contact this company.")
30% links that include your keyword but also include other words in a sentence (for example,"I ran out of my brand new business cards today.")
30% links that include only your keyword (for example, "I love my business cards.")
20% image links