Yes, I have downloaded some classics from here, and am very impressed by them.
But Calibre don't allow direct download from MobileRead. A pity, since there is a rather strong connection between MobileRead and Calibre.
Calibre should perhaps give an option, on new install, to fetch a wide sample of books from MobileRead? Just click a button for the format you would like... Perfect metadata. Nice covers.
It would be fun to follow the work with "The MobileRead Good Book Pack for New Calibre Users".
