Entrepreneurial Work Ideas...

Hi all,
I am about to relocate to Japan permanently, somewhere in Tokyo. Will be moving mid next year.
I previously (long time ago, nearly 8 years!!) lived in Nagoya for a couple of years doing the English teaching thing. Since leaving I have done fairly well for myself - run a couple of startups, worked at a Fortune 500, etc - and now am having to decide what to do in Japan.

I own half of an export business there, and that will pay the bills, but I am keen to start something a bit more entrepreneurial and exciting.

I have enough capital to cover the startup costs in most industries I guess - I'm just keen to know if anyone here has started a business in Japan? What are the boom industries? Which are to be avoided?
All advice appreciated!
Cheers!

Look at what JETRO offers for advice and info, as well as 外資系転職求人サイト[Daijob.com]外資系・英語求人10000件!

Thanks for the advice!
There is a lot to dig through on the JETRO site, will come in handy. Daijob not so much, as I'm not looking to be working for someone else. Thanks for the thought though!