The Standing Stones in The Elder Scrolls V: Skyrim are wonderful little additions to the game. Basically, they give your character modified attributes, or special abilities to give you the upper hand in the game. For example, if you activate The Mage Stone, you'll learn all of your magicka skills 20% faster. Long story short, they're awesome and you should find as many as possible.
The Achievement Hunters, Fragger and Geoff show you the location of all of the Standing Stones in Skyrim. Do this, and you'll get an easy 30G on Xbox 360 or a silver trophy on PlayStation 3. Now if you'll excuse me, I need to find the rest of the Standing Stones.