Of the books Amazon is currently touting as part of the collection, the title that immediately jumped out at me is Harry Potter and the Sorcerer's Stone, which is $8.99 for the Kindle version sans a Prime account. Over in the non-fiction section, there's a range of Lonely Planet travel guides, which could be handy assuming you're planning a trip to one of the destinations on offer at any given time. As for magazines, there's GQ, National Geographic Traveler, and, full disclosure, a handful of Time Inc. publications including Sports Illustrated and Entertainment Weekly. (Time Inc. is TIME's parent company.)
Is it worth getting Prime for Prime Reading alone? Probably not — there doesn't seem to be enough here quite yet. But it's a nice addition to the Prime package, which most notably includes free two-day shipping but also an ever-increasing raft of other benefits, like free photo storage and access to Amazon's streaming movie and TV libraries.