Fran's pick, the website of the American Council on Exercise, includes an entire section dedicated to helping you train smart. This section of the site, Fitness Programs, includes an awesome collection of workouts and a library of individual exercises. Both the workouts and exercises are described in detail and have an accompanying video of an individual performing the workout/exercise.
This site also includes a variety of fitness videos. For those on the go, see the video, Pressed for time? 3-in-1 Combo Exercises, below.