I have to ask - for those of you who work full-time at a company- what do you guys think of the Intellectual Property/Employee work agreements (that you probably signed on your 1st day) - are you worried that if your idea is good enough the company will claim ownership of your work, your idea even if you (wisely) did not work on it during company time or equipment?

I am working to sell (not financially, but buy-in) a startup-type project to my company. It might involve developing the prototype and emotionally selling the prototype to key individuals. But if that happens, then I'll be able to work on it officially.