A great piece in the New York Times on Mozart and the development of the piano.
Check it out, folks !
and I do second their recommendation of "The Secret Mozart":
"....“The Secret Mozart” (Deutsche Harmonia Mundi), third in a continuing series of intimate portraits of famous composers seen through the lens of the clavichord, Christopher Hogwood offers a range of works — from a four-handed sonata to a little piece the 12-year-old composer doodled on the back of a program — on three different 18th-century clavichords, one of them Mozart’s own. (Even tuning was in flux; each instrument is tuned to a different, increasingly higher pitch.)"
Also check out this CD.