If he's not already on your radar, he should be: Sage Lewis is a great resource for all things SEM.
Here are some of the places you can find Sage Lewis sharing information and advice on a variety of topics related to online marketing, from SEO to analytics to social media marketing:
- The SageRock Digital Marketing Blog  is the blog of SageRock Inc., a digital marketing agency that offers online marketing services, including consulting and training, in search, social media, mobile and rich media, behavioral targeting and other areas. Recent posts have covered topics like the death of print advertising ("In the future, TV and print will just be a support mechanism to the 'real' marketing that happens online. The reason I know this will happen is because of one simple reason: Online marketing can be tracked.") and using Facebook as a marketing tool ("Keep a close eye on Facebook for your business. I predict this will very likely become the second most important place to promote your business (after Google).").
- Sage does a series of video blogs for Search Engine Guide  which are great if you prefer to listen and watch (the videos are personable, conversational and engaging) to get information versus reading. Recent videos have included a roundup of social media monitoring tools, a how-to on creating a text marketing campaign, and an analysis of the increase in social media marketing spend among B2B companies.
- Sage also regularly contributes to Search Engine Watch , where he's written about spicing up your social media promotions, the risk of paid links and other link building topics.
- Sage is also on Twitter: @sagerock .
We hope you'll take advantage of Sage's expertise!