To master Tokyo life,you should try to use Yamanote-line of JR-East.
There are a lot of populer stations you've heard Shibuya,Shinjuku,Akihabara and so on.
Many people upload movies to YouTube about Yamanote-Line.

http://s-ohtsuki.sakura.ne.jp/jr/yamanote/newpage00.htm

http://www.youtube.com/view_play_list?p=8B306B62E0955A4E
http://zapanet.info/new/douga/?keyword=%E5%B1%B1%E6%89%8B%E7%B7%9A
Akihabara=秋葉原
Ikebukuro=池袋
Shinjuku=新宿
Shibuya=渋谷
Shinagawa=品川