I find all editors I used somehow broken. I've used Emacs, Vim and Eclipse so far, and all of them seem at the same time appealing and defficient, each has something cool other two lack, and something that really sucks. (For example I love that I can has Haskell repl open as buffer in Emacs, but I hate Emacs keybindings). There are also a few editors I haven't tried yet (which I should do), and I'm aware that all of those I tried are customizable by plugins. Perhaps a huge pack of vim plugins would be solution here; but maybe we need some new concepts about editing, browsing and running code? I believe there are lots of things to try out there, and I hope that LightTable will deliver some new great tools, the kind of 'obvious in hindsight' ideas, that you can't live without once you tried them.
...given the assumption that were talking tech startup stuff.
World-scale MMORPG based on real geography.
Virtual worlds - transfer your consciousness to a digital substrate.
If your talent was truly unlimited, you could do every startup.
If your money was unlimited, then you would probably get assassinated.