Magicbox listed Namco's sales for 2004. Some interesting things to note. Look at the difference between the titles and the countries. (I'm not going to steal all of their info)
Here's what really interests me: Namco's top sellers in North America:
Namco Museum (GBA) - 1,700,000
PacMan Collection (GBA) - 1,301,000
Namco Museum (Multi) - 815,000
I can't believe that those three titles were so big for them. That doesn't even include the other three Pacman titles in the list! Retro gaming still sells.
It's also evident that Japan's big sales still go to the RPG titles more than anything else.