As Black Friday approaches, there are more and more ads and mentions on wish lists for the latest crop of single-serve coffee makers. Starbucks recently threw their hat into the quick-brew coffee market with their Verisimo system. The Nespresso coffee system has popped up in more stores, and everywhere I turn I seem to find a Keurig of some sort. As a coffee lover, these hold the promise of a perfect cup of coffee on-demand. Some part of me, however, wondered if it would result in unhealthy levels of caffeine consumption. Click here to get the full story on coffee consumption and whether it’s actually okay for you.