Got this link via Nicholas Whittier and thought it was worth sharing, since many of my friends are also Renaissance geeks.The full post is worth reading, but the summary is this:
What separates a generalist and a dabbler? Generalists ship.
Generalists finish things, produce things, have end-points and accomplish them. They may accomplish things in many fields, but they do finish them.
This is a weakness of mine. Oftentimes I trail off after a strong start. It may be worth considering, for me, to have goals based on process rather than specific products - to have my goal be to make products of some sort, and accept that I will ship things across many domains, and that I'll have to explain that to people constantly.
This way, at least, I'll have things to explain them with.