I fitted one of these last night - http://www.amazon.co.uk/exec/obidos/..._ya_oh_product

Very happy with it. Spent some time cleaning the screen properly and being obsessive/compulsive about dust (seriously - I went into the bathroom to fit it having ran the shower for about 15 mins first to de-dust the room with steam). Extremely clear, and hasn't made a noticeable impact on the screen's responsiveness. I'd certainly buy another one if i needed a replacement somewhere down the line.