I have a large pillow case folded up which covers an A600 fully, and like a small table cloth over my A1200. This is despite them already having dust covers. AmigaKit have some new ones in stock which I might take a look at. Although I'm sure they won't be as effective as a towel! What sort of towel do you use? I've been thinking of upgrading to a really thick towel or similar but you have to be aware of the weight pushing down on the keys...not good in the long term for the key springs.