When they click on the link, they are taken to a landing page that has strong copy that reveals the biggest benefits of your product or service. Show the prospect how their life will change. You want this landing page, also called a signup page or squeeze page, to be short and to the point. (It is possible, of course, to just send them to your main website. But it could be distracting with all the links and different pages.
Offline events like trade shows are highly anticipated growth opportunities for professionals in your industry. Demo your latest product at an appropriate conference and collect signups in-person. Once you're back at the office, import these signups into your contact database. Be sure to send these contacts a welcome email that confirms their opt-in to your list. (See #8 in this blog post for tips on sending welcome emails.)
Someone who has done a great job of becoming known in many verticals is Chris Guillebeau, he sits at the intersection of many markets like travel, entrepreneurship, artists, and so on. I personally stumbled upon this idea with my different blogs and businesses in the raw food market, when I realized there was a lot of overlap and people would follow me from one topic to the next.