If you built it they will come, just imagine a marketing plan that interconnects all aspects of your and your clients' existence. Harness the data, then meta-data, then analyze across the board not forgetting that everything is connected, then optimize...oops, let's call it SWO - semantic web optimization. Optimization within subnetworks of networks and so-on. Then react accordingly and distribute your own data with your own meta-data. Then track and measure the impact across the board, analyze, re-analyze, mash it all together, add a pinch of nutmeg and think for a second that you're done.
Marketing plan that mines the semantic web for customer service, market research, customer monitoring, competitive intelligence, brand protection and something else that I can't even imagine. Your brand in all of the spheres - blog-comments-forums-viral-social-micro something and Google. Because Google will not die anytime soon. It is afraid, but afraid with lot of money. Every time it gets scared it will buy whatever makes it scared. Twitter's next.
Semantic branding and marketing, it's coming and it's gonna be cool.