Besides putting logos in your Media Center, My Channel Logos also provides many other features including changing the number of rows in your guide and mini-guide.
My Channel Logos is highly recommended to spice up your Media Center and Recorded TV HD!
Inside Recorded TV HD all channel logos will appear instead of the call sign you have My Channel Logos v2 installed. If you only have v1 of My Channel Logos the logos for your affiliate channels (ABC, CBS, NBC, ...) will not appear.
Check out My Channel Logos.