[mindcrime]

The closest thing to that that I'm aware of is barnacl.es

That site is aimed at entrepreneurs, with a particular focus on people who are bootstrapping instead of pursuing VC money. A lot of the discussion there tends to involve marketing, although the site isn't necessarily aimed at marketers per-se.

[sdomino]

Another one that this reminded me of is "The Backstory" (http://talk.andrewchen.co/) by Andrew Chen (from Uber). It deals a lot more with marketing and growth but is still a great resource for entrepreneurs.