They're everywhere, these ancient inherent truths... and an example of how things seem to be converging in my life. Reintroduced to them in 2006 by my acupuncturist (Pilar, an amazing healer), I'm now an avid student of them. They just make so much sense, on a number of levels.
They have some pretty intriguing applications, some of which I'm exploring through my client work (branding and organizational development), and through my art. Just this morning, Julia Cameron made reference to them in her book, Walking in This World. If you don't know her work, you should.
Don't take my word for it, though - check archetypes out for yourself.