on TTstuff on the wipers page they have Audi TT: Drivers 21" Passengers 21" curved. Does this mean that both the drivers side and the passengers side are curved or is it just the passengers side that is curved?

 

Believe its the pass side is curved, otherwise the wiper doesn't make contact on the far side of the windshield. Considering I'm pretty much NEVER looking out of the lower right side of the windshield, I don't concern myself with curved wipers.

 

you are correct, just the passenger side is curved