TrackMaven
In addition to getting great monitoring in place, you’ll also want to get a general marketing analytics tool working for you. I’ve always thought TrackMaven’s sounded great. They give you the numbers around web, social, and content marketing – both for you and your competitors.
Since the biggest mistake you can make with competitive research is spending too much time collecting information (and not enough time actually analyzing it), a tool with a strong focus on taking numbers and making decisions will help you turn data into action.