From works of Cornelia Funke I enjoyed "The Thief Lord" the most. Inkheart had the moments, but I found the last book too childish the moment it came out, in consequence have never read it to the end
Jostein Gaarder is great, I remember Sophie's World plot blowing my mind up, The Orange Girl is pretty neat, too.
Funny thing happened to me recently. I've been doing some music-related research, mostly in French. Looking for a confirmation of something, I clicked the first googled wikipedia link (undoubted source of information!), believing it to be in French (I don't know why, self-suggestion or something). After reading (and fully comprahending) three out of four sections, I noticed this French was a little bit bizzare...
No suprise, since it was in fact Italian.