Although I've been a big fan of RC Car Action magazine for years, I think RC Driver Magazine surpasses them in their coverage of latest trends and current RC vehicles. They also offer a greater variety of both beginner and professional RC enthusiast tips, tricks, and tutorials. Published monthly, they cover all types of RCs but primarily focus on cars, trucks, motorcycles, and dune buggies.
Still one of my favorites, RC Car Action is more for the intermediate to professional RC enthusiast. Content is geared more toward advanced techniques for tune-ups, mods, and upgrades. They have great reviews of the latest RC vehicles, including tech specs.
This monthly magazine has reviews, tutorials, and tips geared toward professional RC topics and racing. Many readers of this site swear by this publication.