If you've just got out of college and just want to make a quick buck to pay back your student loans or travel around the world try IT jobs in Tokyo.  Companies are desperate for programmers & Internet project managers.  You can make a bundle.  Be sure to shop around too!  Scour the web sites and get your name on the list of some major headhunting firms.  Companies are paying big bucks for IT guys these days.  The same goes for you business/finance guys.  Datek and Charles Schwab are looking for you and the demands will only grow in the future as Japan gradually pulls out of it's economic slump.  And, the IT, business/finance jobs are nearly all in Tokyo.  English teaching is the only case where I would not recommend a big city.  Forget Tokyo and forget Osaka.  The market is flushed with teachers, the rates are dropping, and the cost of living will eat up your cash.  You will be much better off financially in a smaller city like Nagoya or Shizuoka.  One warning: It IS easy money but if you're a real teacher you may not feel professionally rewarded.  If you want a "real" teaching job, a private high school or University is the way to go for you.  But these jobs are very difficult to get directly (without a good contact).  Don't go through an agency!   If you do, they will take their commission (up to two-thirds of your income), and you will not be included in decision-making; it will be a very painful professional experience for you!  Many schools still don't quite understand they if teachers are paid more, and paid directly from the school - they will give more!  But many schools don't want to have to deal with you directly, so they go through agencies and pay them to pay you.  It's a worthless step and sad because it has an all-around negative effect on education in this country.  But if you have the right contacts and can get paid directly by the schools, you'll have one of the best teaching experiences possible.

Learning Japanese.  Business Japanese and conversational Japanese are 2 different worlds. You might be able to schmooze the local waiter/ waitress with some cool comments and a cute smile but the hard headed, traditional Japanese SALARYMEN are going to want to hear you speak in a polite and articulate manner using KEIGO (the polite form of Japanese), which is the standard, cordial language that all business is conducted in.  Even if you can speak really well you may also have to face the fact that you are not Japanese and are, by definition, an outsider.  No matter how professional your efforts are, you may still need to be accompanied by a Japanese person for your business ventures.

Whatever industry you're in, you'll probably come across the "no contracts" policy of a lot of Japanese companies.  Believe me!  Insist on a written contract.  If they value you, they will sign for you.  Also, insist on a copy in your native language, drafted by a professional.  Many companies claim that this is the Japanese way not to have contracts- not true!  Just smile and say that having a written contract is the global standard.  Often Japanese give into words like international; global and "In the USA they...." It's amazing how you can justify an idea just because it's what the standard is in the USA!!!  Please just make sure all your business is written in an agreement or official contract signed by both parties - with their name and the job title and name of the company.  Clearly defining the job is also important in this agreement you make with the Japanese company because the Japanese language is inherently ambiguous; make sure you understand exactly what it is you'll be doing before you agree to anything- especially if it's just a "favor".  Many times for me, a little "favor" has turned into a major ordeal that I should have billed several thousand dollars for.  And these were my friends!!  All of my expat friends have a policy: we charge our friends, but at the "friend's rate"- everyone benefits.

Having said this, small gestures and tokens of appreciation are very important in Japan.  Never overlook these small things that are noticed only by their absence.  And very often Japanese will reciprocate in kind.  You'll enjoy the Japanese hospitality, make lots of money and discover the power of the yen as you wield it on some choice retirement property in the Caribbean like my expat friend, B-san!  Establish your business contacts, nurture them, learn Japanese, take an interest in the culture (also appreciated by the Japanese Business community), make your contracts, corner your market and enjoy your Japan experience!