Not the usual way you can submit thousand of directories to with SENUKE or whatever, but reputated SEO directories with manual submissions and anchor text edition and deep links allowed.
Google wants "natural" links, so a human approval gives this links high value. Regarding that many of this directories allow just an anchor of "3w. mysite .com", one of the anchor text recommendations after penguin.
So, have this links more value now? Would it be a good strategy to get back to this manual submission links?
As a SEO agency, would it be good to build an own directory sites network? As some are doing now with a blog network with different class C ip, can it complement a link building strategy? What do you think?