Scientific American's The Top 10 Science Stories of 2009 [Slide Show]
Discover's Top 100 Stories of 2009
As I'm writing this up, Discover has only posted up through story #65, but will be posting the rest of the stories through January. If you haven't already seen the list in the print copy, you may want to bookmark the page or subscribe to the feed to keep up with the list. The top 100 is always the issue I look forward to most.