Higher Learning is one of the most peaceful achievements in the game (all you have to do are read a few books that spawn around Dalaran), but it's no less desirable for that -- the achievement grants a miniature Arcane Elemental pet that looks awesome. Teniblue over on WoW Ladies has a few good tips if you're trying to get all edumacated in Dalaran -- she's got links to two addons (including the perfectly-named Dalaran University) to use to help you track spawn times, and she's got a link to Breanni's great guide over on WarcraftPets.com (which our own Allison R. touched on briefly in a recent OverAchiever post).
What's fun about this achievement is that reading the books won't delete them, so it can be very social -- people have created #bookclub channels on many servers to keep track of when and where books are appearing in the city. That makes it a lot more fun than the, say, cooking daily quest that sends you after mushrooms in the sewers. It actually makes this social game, well, social.
So next time you see a book sitting around the city, be sure to give a shout to the chat channel -- here's one in-game situation where everybody can benefit from a little extra chatting.