This is the best tool you can get. You can use video camera or CCD camera to talk on the web. Since this is English version, you have to choose Japanese font to enable you to chat in Japanese. This one is very convenient. This one is English version and you have to Japanesize it.
Japanese page is here.
Talksender can let you exchange voice and pictures. You don't need any additional software to record your voice. This one will import most of the address book from your e-mailers. The best thing is that it goes across the platform. This one is fast and easy to use.