I thought the Carmen games easily hit the target age due to content alone which tied right in with a child's level of reading, geography or math. It's why they were used so widely in schools. I don't see anything that has the same kind of research or ability to pull children in these days, that gap in the market seems to be filled with things like angry birds.
Thanks for posting this... and making me feel old.
i'm at a conference and just tweeted "there's an elsevier rep in the room. KILL HIM! KILL HIM! HE DOES THE WORK OF SATAN" and couldn't quite place what i was referencing... then i realized it was glados saying "BIRD! BIRD! KILL IT! IT'S EVIL"))