Language pack:
http://packages.ubuntu.com/gutsy/translations/language-pack-gnome-ja

Firefox stuff:
https://addons.mozilla.org/en-US/firefox/addon/1865
https://addons.mozilla.org/en-US/firefox/addon/421

Internet Stuff(Flash, Java):
http://packages.ubuntu.com/gutsy/web/flashplugin-nonfree
http://packages.ubuntu.com/gutsy/web/j2re1.4-mozilla-plugin

Anime player:
sudo apt-get install mplayer
sudo apt-get install w32codecs libdvdcss2

MP3 player: 
sudo apt-get install amarok

Bittorent:
sudo apt-get install azureus

Uhh, there's still more but use these for now

sudo apt-get install wine