Update! Click here (Tips for Working with Color in Photoshop CC) to see all tips for working with color in Photoshop CC in a single post.
In Photoshop CS5, Adobe introduced the HUD Color Picker to make the selection of a color even easier. (To access the HUD Color Picker with a painting tool selected, Control + Option + Command (Mac) -click anywhere in the image area and drag to select a color. On Windows, Shift + Alt + right-click and drag to select a color.) In Photoshop CS6, the HUD Color Picker (both the Hue Strip and Hue Wheel) have an additional choice for size – small medium and large which can be set via Preferences > General.