A Gaming PC for an 8 Year old

[Bells]

So, as i got a brand new pc, i decided to give my Old one to my Nephey, he just turned 8 and i'm on a mission to make him a nerd to screw with my sister's head.

I already bought him the full collection of The Lord of the Rings and Harry Potter. It's a matter of time now. I also introduced him to the Wii and from that got my sister to give him a PS2.

Now, this pc of mine, it's a rather Old machine. With limited specs and space. The main idea here is to fill it with a ton of games and software that can help him learn something and have some fun.

I went through my very very old collection of PC disks and so far this PC has

Castle Wolfenstein - Enemy Territory
Spiderman 2
Need for Speed 2
Revolt (RC car racing game)
Civilization 3
Age of Empires 2
Command and Conquer Generals
Command and Conquer Tiberian Sun
Rockman X8
Starcraft
Fifa 2002
Metal Slug 5 (via Emulator)
Bloody Roar 2 (via emulator)
Taxi 3
X Men Legends 2
Driver

So, it's a Sizeable collection, but i'm not really done. I want to give him a variety of games of several styles and types. Even quite a few i know he is too young to beat. Just to plant the seed of curiosity and mild frustration that we all had with out Battletoads and Starfoxes ....

And Shying away from Ultra Gore games like Soldier of Fortune 2 or Carmaggedon, even though he does Play GTA 3 on the PS2 and it's Oblivious the any Malice the game might impose. He just like picking up a bunch of cars and driving them to a parking lot mostly...

I also tossed Google Earth in there just for kicks...

So, any other games or software you guys would like to recomend? My pc will be able to play mostly anything up to 2007, here are the specs

Semprom 2500 (1.7Ghz Single Core)
512 Ram
Geforce FX 5200 256mb

I have about 10Gb Free right now...