My best word was "Quixotic", in the corner. That gave me a Q on the "triple word score", an X on a "double letter score", and a C on another "triple word score". Combined with the other words I added onto, it ended up being 350+ points (I don't remember the exact number anymore).
I just glanced at the stats on my facebook scrabble, and it says my best word was dreamily for 102 points. Based on the point total and letters involved I'm pretty sure it had to be a bingo on a triple word.
My sister-in-law is a Harry Potter fanatic, so we decided to play Scrabble where Harry Potter words got double word score automatically, on top of any other multipliers.
I got Azkaban. I think it was over 500 points. Too bad it wasn't real Scrabble.