You can also read about design and user interfaces, it will not help you directly in making "pretty interfaces" but it will help you make "interfaces that just work".
Believe it or not one book that helped me with designing web/desktop interfaces was a game design book.
Both books teach interesting stuff about designing interfaces and the game itself that can be translated to software and web, specially the first book.
Believe it or not one book that helped me with designing web/desktop interfaces was a game design book.