Drew Houston, visionary. The only word that can summarize the man behind the idea and now budding startup, Dropbox, Inc.
The idea was conceived while in college as said by Houston himself. He would always forget his USB Drive and wanted another option for himself. He turned an idea that was meant to aid him to something that now aids an approx. of 50 Million users around the world. As of October 2011 as reported by Forbes.
Starting with an investment of just $15,000 by Y Combinator. Houston was able to turn an idea to a company with an estimated value of $4 Billion.
Here is a short interview conducted by Forbes: