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I prefer to really control how Google finds a site ie if it is a design company I like google to either find it through a 301 redirect from an old domain etc or if it is totally new a site or forum 'related' to the site's theme. Just a habit, I certainly dont submit my site directly.
But a client I have has the site on adwords already. Will Organic Google come to visit?
I've never done the experiment so I can't say for sure. But if you want those urls not to be indexed at all for organic search, I'd suggest taking proactive steps in robots.txt and/or robots meta tags.