Startup companies can come in all forms, but the phrase “startup company” is often associated with high growth, technology oriented companies. Investors are generally most attracted to those new companies distinguished by their risk/reward profile and scalability. That is, they have lower bootstrapping costs, higher risk, and higher potential return on investment. Successful startups are typically more scalable than an established business, in the sense that they can potentially grow rapidly with limited investment of capital, labor or land. (Wikipedia)
This is an overview of startup resources, information & metrics I came across the last couple of years.