Interesting how the more established / successful sites rely much less on Search Engine traffic (and therefore
SEO) than relatively new ones.
Direct traffic speaks for itself - if your site's brand is established, people come straight to you.
But what role do referring sites play? Are these generally sites on which you've paid for advertising? Are they sites that link to you (reciprocated or not)? Are they sites and blogs that have picked up your articles / feeds?
I'm interested to know how best to progress - should I focus on-site or off-site?