The following is a great posts written by Dave Bascom of SEO.com, a company which one of my past interviewees (Mike Mann) has his hand in. Mike Mann knows this business, so any tips coming in from him or his affiliated companies are worth reading:
You should be paying very close attention to which keywords [...]

Today I came across a very interesting site/service/social networking platform called Entrecard.com. The concept is this, blog owners can swap ads (blog ads) with one another using a points system. You gain points by visiting other blogs that are within the Entrecard.com network. You also gain points by selling ad space on your site. [...]

Trying is your first step towards either success or failure. Your perseverance will determine the result.
Failure in my book is either not trying or trying and then quitting at the first negative result. Take my interview with Curt Schilling this month. The most common question/comment I received was “wow, how did you manage to get [...]