Dieter Rams: Principles for good design
vitsoe.com
vitsoe.com
But if you can take the time to figure out what he means you can use it to help judge your own creations and see where they are lacking.
Just because, it's simple doesn't mean it's not valuable. The best experts I know make things as simple as they possibly can.
I'm sure there is plenty of good design that is not innovative. In fact, there is lots of value in sticking with what is familiar to the user, i.e. avoid innovation.
A few of the other points reinforce exactly that, such as:
#4 Good design makes a product understandable
#10 Good design is as little design as possible
The fact Dieter stripped out the inessential aspects and frivolous features, focused on the intended function and made simple products aesthetically pleasing was innovative at the time. And still would be today for most consumer electronics.