Got these ones yesterday:
They're both really great. The comic TPB gathers the first arc, comprising issues #1-4, and has already been discussed in this thread and the chat - let it just be said that I don't know of anyone who hasn't loved these particular issues.
The "Elements of Harmony" guidebook is also very good. It's about 250 pages long, very well presented, and contains bios for all characters, episode guide, song lyrics, descriptions of locations and mythology (nothing new to us, though), and an interview with Lauren Faust. If there's something bad to be said about it, it's only that it overuses the old stock vectors a bit. Even so, I recommend it to all fans of the show.