I don't even want to look for it, but I responded to Dannyalcatraz's quote above with my own, but that's from the old days.
Now a days, the crossover happens nearly every day. You see I run a graphic design studio in a small city, but I also create maps and illustrations and develop content, page layout, etc for my Kaidan setting for Rite Publishing and PFRPG.
And because I have no means of keeping my mouth shut, every single customer from homemaker to attornies, engineers, city planners - everybody who comes in my shop, knows what I do, and my strange historic, literary, old deities/cultures knowledge. Returning customers ask about the status of this publication or that, and ask to see prints, etc.
I'm not very subtle in my 'crossover' anymore, and people seem to freely accept it fine and positively so.