Spook, you can't go wrong with the Snack Guides, the Holiday Guide, or any of the other Park-specific guides that they've published. Their new one, for example, is geared toward Animal Kingdom and Hollywood Studios, which is perfect for me, because they're the parks where I'm not as familiar.
You dump any of the guides onto your e-reader or tablet, and can read them anywhere. If you're connect to the Disney Guest Wi-Fi, you can click on any of the links within the guide and they will take you straight to a lengthier post about on DFB about that place. So, it's helpful whether you're connected or not, as long as it's loaded to your reader!
AJ is the best of the best. There have been many come along since her and try to duplicate what she's done on DFB, but there's just no comparison. She's real, she's honest, she's nice, and she's funny, all attributes that totally float my boat. She is the real deal!