To orchestrate effective campaigns, marketers need access to any tool they can lay their hands or eyes on. A major one is good content, which, helpfully, is freely available online.
The AdAge Power150 list may be gone, but this alphabetical listing of some of the best marketing blogs out there should help.
Articles on Adobe’s Digital Marketing Blog cover SEM-related topics. The blog is organised into 10 categories, including conversion, targeting, mobile, and analytics. Emphasis is on tools and tactics.