It's really about the broader industry rather than your product idea.

Can you see yourself researching opportunities in an industry for a while, and not being particularly emotional about any specific product idea?

If yes, you can very quickly and cheaply test out any idea for a product in your given industry with PPC, and you can start an SEO blog using Wordpress (I suggest Hostmonster) to tie together your PPC data and analytics in a giant data-driven feedback loop. This research-driven marketing approach will enable you to test out any product idea, and not lose ground if one doesn't fly. More specifically, if you have PPC/SEO keyword and traffic data that's tied to conversions you can almost instantly switch to a different product idea and still maintain marketing momentum.