Tough one- as far as inspiring me, "Facing Up" by Bear Grylls. It would take a long time to explain the inspiration that that gave me. As far as just being brilliant, Dante's Divine Comedy. Amazing philosophical/theological points, tied in with historical and literature references... and it all rhymed.
I just realized I never answered this myself - my favorite book is Heidi. I have a copy that has been passed down since my Great Grandmother, and I read it every Christmas. Reminds me to never lose hope; everything works out in the end.
that's cool, I've never actually read heidi. seen the movie though, does that count? my family comes from that region- switzerland, bavaria and the old austrian empire.
Profound yet simple and absolutely hilarious to read: #1. Wind In The Willows - About a pompous, uppity toad and his misadventures. I am defining "favorite" by the most number of times read over the last couple of years. You can get through this one in a day.