The techy section of Tokyo. If your looking for some cheap electronics and especially if your in the US and want a MD player, don't forget to stop at Akihabara. The MDs are less expensive and you get a better selection. Oh, and the best thing of all is that you can see the most recent designs opposed to the big and bulky left over stuff you find in the stores in the States. I forgot the price of mine, sorry.
Many Japanese people have the case of bad teeth.
Life will go on. In front of many subway stations you will probably see rows and piles of bikes. Telephone cards are a good thing to have when your in Japan. If you have one handy, you won't have to deal with change. By the way, save the card when it get's used up.