SciAm is more thorough, and isn't afraid of the complex or the difficult. Origins Archive is bookmarked for reference whenever I foolishly allow myself to be drawn into that debate. If you find yourself forever telling people things they don't want to hear, you might appreciate it. If you don't appreciate it, please don't mail me. I won't answer.
Trout is a wonderful thing.
I've been reading it for years now, never missed an issue. It's agreat deal more British than The Onion . Visit the Tom Lehrer section especially. I really like it. The All-Music Guide is one of my primary tools in my effort to educate myself about music, and find new people to listen to.