"Work on your business, not in your business"
the problems are the same - technology can help you solve them, but fundamentally it's an issue of how to scale up in terms of people. Here's another one:
http://www.amazon.com/dp/B004IYISQW/?tag=dedasys-20
with a cute story, but the concepts are pretty similar.
Rob Walling also covers this, briefly and more to the point in Start Small, Stay Small:
http://www.amazon.com/dp/B003YH9MMI/?tag=dedasys-20
Which is also full of real, practical advice for people doing small software businesses.