Appitic is a great site for finding relevant educational apps. It is easy to navigate and the design is simple and clean. This is my new favourite site for finding apps. For me one of the most important aspects is the way that these guys have organised their apps. Not only have they organised them in traditional key learning areas but they have also generated lists of apps that work within the scaffolds of Multiple Intelligences and Bloom's Taxonomy. Great job guys!
Make sure you check out the Guides section as well, the four Apple Distinguished Educators who have put this together - Alline Sada, Alberto Valdes, Hannah Rollwitz, and Brian Zink have done a great job of creating some simple and easy to follow classroom guides. Well worth checking out.