Hmmm, I don't know if "Life of Pi" counts, seeing as I had already read it before it was ever assigned to me. But I did like it!
"House of the Spirits" and "Things Fall Apart" were good too.
I feel so lucky! My class at college this year was studying love through the ages, so there were assigned texts of Othello, Much Ado, The Great Gatsby and Wuthering Heights. But apart from that my teacher let us basically choose what we wanted to read.
So technically they were assigned texts just not actually assigned by the teacher. I read a lot of Ian McEwan, Chekov and many other Russian writers as that was were my interests were leading me :) Great fun!
Out of a lot of books which I probably don't recall...
The Life and Times of the Thunderbolt Kid by Bill Bryson (GREAT NERDFIGHTER BOOK)
My Side of the Mountain
The Tale of Two Cities
The Adventures of Huck Finn
Black Boy (which is now banned at my school... which is sad.)
Shakespeare this year. Last year my teacher didn't go through it as thoroughly as I would've liked, but this year I loved it. Plus we did Romeo and Juliet and it just annoyed me.
I'm relieved to see Fahrenheit 451 here, though. It's my book for summer reading. :)