Here is a link to the best place I have found for Angry Birds 3 star guides. They have video and text walkthroughs and if you have trouble with a level be sure to check the comments at the bottom as I have found them helpful. Note these are for the phone version but it will work the same. As of this writing they do not have a guide for the "Exclusive Levels" planet but let me know in the comments if they add them.
http://www.angrybirdsnest.com/category/walkthroughs/angry-bi...