My new obsession with Twitter (follow me as @draab) has led to several messages from people who seemed to have trouble choosing between Eloqua and Marketo. This is a bit perplexing, since those products are at the opposite ends of the spectrum: Marketo being relatively low cost / limited functionality / easier to learn, and Eloqua being higher cost / richer functionality / takes more training. Marketo is certainly a fine product, but marketers should still look around before picking it by default. They focus on email nurturing campaigns and marketing measurement.