I suggest everybody to do the following exercise with ideas:

Mark all your ideas in a chart where the x is the time (i.e.: man month and resources involved) to develop the idea and y is the potential, usually they will have a lot of ideas that will require a lot of time/resources, so the trick is how to move your idea towards the 0 (lean company). But I think this is more an art than a science.

I wrote a brief post about it last week: http://blog.databigbang.com/ideas-and-execution-magic-chart/