Open Source Software
I think there is a lot of open source software that can be very good for many one day ideas. As the open source community gets more steam, there is more and more high-quality, customizable software that can be used.
One of my favorite classes at NYU was Technology & Innovation. In it, the professor talked about how many of the most successful entrepreneurs aren't necesarily the people who create the technology breakthroughs. It's the people who come up with creative applications of the breakthroughs and monetize it.
To my knowledge, Sourceforge.net is the best search engine for open source projects. Is this accurate?