Look into software engineering.

Being able to write interesting programs isn't just a matter of knowing how to use your favourite language (although that certainly helps). You also need to know how to manage complexity; otherwise, you'll get bogged down fixing bugs rather than adding features (which is the fun part).

If you can stand buying more books, have a look at The Pragmatic Programmer and The Practice of Programming, both of which are excellent discussions of the practical world of writing code.