Ahhh, favorite genre, eh?
Well, like just about everything in life, it's complicated. I like just about every genre for it's different reasons. There are a few I don't like though.
1. Books about reality teen troubles and success- The Babysitter's Club, the Princess Diaries, etc. To me, the charecters are almost brainless and acieve nothing throughout the book.
2. "Bad" books about animals (fiction)- I have read enough fiction books about Veternarians to know they just aren't the books for me, period.
3. Romance- I don't like romance at all. I'm not someone who believe that one would hike 2,000 miles to see someone that had an affair with. I know, I'm generalizing, but I don't like romance. I will, however, tough it in a case where I'm reading a book I love, such as Peirs Anothony's
Incarnations of Immortailty series. Even though those books have some, well, "interesting" moments (to say the least), I like what the actual story is, so I can deal with it.
4. Gothic Novels- I just don't know why I don't like them...
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I tend to have an open mind when reading a given novel or book. I like to read many things in the non-fictin area, such as computer science books, designing web pages, philosophy, feng-shui (I don't believe in it, but I like how certain aspects make your life more organized), photography techniques, among other things. I like learning languages (I'm fluent in American Sign Language and am learning French and Latin) and statistics.
I like to read science fiction, fantasy, Roman/Greek myths, mystery, comics (

), and, to some extent, classic literature. Depending on what kind of book it is, I like reading contraversial things, such as Harry Potter or The Incaranations of Immortality or His Dark Materials triology. They can be interesting.
It's hard to limit yourself to a few favorite genres. There are so many great books out there!
-Len